BEGIN:VCALENDAR VERSION:2.0 PRODID:-//SPIP/Plugin Agenda//NONSGML v1.0//FR X-WR-TIMEZONE:Europe/Paris CALSCALE:GREGORIAN X-WR-CALNAME;VALUE=TEXT: -- Laboratoire de Physique des Solides - UMR 8502 X-WR-RELCALID:https://www.lps.u-psud.fr/spip.php?article0 BEGIN:VEVENT SUMMARY:L’héritage de Marie Curie UID:20180614T175719-a3135-e239@https://www.lps.u-psud.fr DTSTAMP:20180614T175719 DTSTART:20180621T133000 DTEND:20180621T150000 CREATED:20180614T175719 LAST-MODIFIED:20180614T175729 ORGANIZER;CN=Marie-France Mariotto[:mailto:mariotto@lps.u-psud.fr] ATTENDEE:Vita ILAKOVAC CATEGORIES:L’héritage de Marie Curie URL:https://www.lps.u-psud.fr/spip.php?article3135&id_evenement=239 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Competing charge density waves probed by non-linear transport and noise in the second and third Landau levels UID:20180621T175916-a3138-e243@https://www.lps.u-psud.fr DTSTAMP:20180621T175916 DTSTART:20180628T110000 DTEND:20180628T123000 CREATED:20180621T175916 LAST-MODIFIED:20180621T175933 LOCATION:Grand Amphi RDC @ LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Keyan Bennaceur DESCRIPTION:Spontaneous charge ordering is one of the many intriguing quantum phenomena occurring in a 2D electron gas (2DEG) under a magnetic field. In the first (N=0) Landau level (LL)\, the short range attractive part of Coulomb interaction is known to be responsible for the condensation of quasiparticles into an incompressible Laughlin liquid hosting a fractional quantum Hall effect (FQHE) [1] and carrying fractional charges. In higher LLs (N > 2)\, however\, the situation is markedly different as the combination of short-range attractive with long- range repulsive Coulomb interaction leads to electronic phases forming charge density waves (CDWs) [2\,3]. In this work\, CDWs were investigated in the second and third Landau levels using non-linear electronic transport as well as noise measurements in a Corbino geometry. Unlike traditional geometries such as Hall or Van der Paw geometries\, the Corbino geometry offers a direct access to the bulk conductivity without any contributions from edge channels [4]. The concomitant mapping of the conductivity versus bias voltage and magnetic field revealed different types of CDWs\, such as pinned CDW phases and/or co-existing liquid crystal-like stripe phases. At particular filling fractions both in the second and third Landau levels\, narrow band noise reveals The sliding transport characteristics under DC bias voltage. This is the typical signature of liquid-crystal like CDWs. of pinned CDWs is revealed by narrow band noise at particular filling fractions in both the second and third Landau levels. In particular\, Tthese results shed new light on the elusive re-entrant quantum Hall states in the second Landau level Landau level\, and they show that these are most likely liquid-crystal like CDWs that can coexist with the FQHE [5]. [1] R. B. Laughlin\, Phys. Rev. Lett. 50\, 1395 (1983). [2] A. A. Koulakov\, M. M. Fogler\, and B. I. Shklovskii\, Phys. Rev. Lett. 76\, 499 (1996). [3] M. P. Lilly\, K. B. Cooper\, J. P. Eisenstein\, L. N. Pfeiffer and K.W. West\, Phys. Rev. Lett. 82\, 394 (1999). [4] B. A. Schmidt\, K. Bennaceur\, S. Bilodeau\, G. Gervais\, L. N. Pfeiffer\, and K. W. West\, Solid State Commun. 217\, 1 (2015). [5] K. Bennaceur\, C. Lupien\, B. Reulet\, G. Gervais\, L. N. Pfeiffer\, and K. W. West\, Phys. Rev. Lett. 120\, 136801 (2018). CATEGORIES:Competing charge density waves probed by non-linear transport and noise in the second and third Landau levels URL:https://www.lps.u-psud.fr/spip.php?article3138&id_evenement=243 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Phase Aharonov-Casher dans les systèmes mésoscopiques UID:20180621T180411-a3139-e244@https://www.lps.u-psud.fr DTSTAMP:20180621T180411 DTSTART:20180629T140000 DTEND:20180629T150000 CREATED:20180621T180411 LAST-MODIFIED:20180621T180422 LOCATION:Grand Amphi RDC @ LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Y. Avishai DESCRIPTION:La phase Aharonov-Casher joue un rôle important dans les systèmes mésoscopiques dans lesquels le couplage spin-orbite est pertinent. Dans cette présentation\, nous examinons la dépendance des observables physiques pertinentes sur la phase Aharonov-Casher (telles que la conductance g et la polarisation électronique P). Premièrement\, nous suggérons une expression de la phase qui est manifestement invariante de jauge. Ensuite\, nous considérons un problème de diffusion dans lequel la phase dépend d'au moins deux paramètres x et y. Notre résultat principal est que la conductance g dépend des deux paramètres uniquement à travers la phase Aharonov-Casher\, alors que la polarisation P dépend de chaque paramètre séparément CATEGORIES:Phase Aharonov-Casher dans les systèmes mésoscopiques URL:https://www.lps.u-psud.fr/spip.php?article3139&id_evenement=244 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Topological Quantum Chemistry And Higher Order Topological Insulators UID:20180618T160944-a3137-e242@https://www.lps.u-psud.fr DTSTAMP:20180618T160944 DTSTART:20180619T110000 DTEND:20180619T120000 CREATED:20180618T160944 LAST-MODIFIED:20180618T160944 LOCATION:Salle de Réunion Parc Club Orsay (commune FAST-LPS) ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Andrei Bernevig DESCRIPTION:The past decade has seen tremendous success in predicting and experimentally discovering distinct classes of topological insulators (TIs) and semimetals. We review the field and we propose an electronic band theory that highlights the link between topology and local chemical bonding\, and combines this with the conventional band theory of electrons. Topological Quantum Chemistry is a description of the universal global properties of all possible band structures and materials\, comprised of a graph theoretical description of momentum space and a dual group theoretical description in real space. We classify the possible band structures for all 230 crystal symmetry groups that arise from local atomic orbitals\, and show which are topologically nontrivial. We show how our topological band theory sheds new light on known TIs\, and demonstrate the power of our method to predict a plethora of new TIs and on the newly discovered Higher-Order Topological Insulators in Bi. CATEGORIES:Topological Quantum Chemistry And Higher Order Topological Insulators URL:https://www.lps.u-psud.fr/spip.php?article3137&id_evenement=242 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Comportement mécanique aux échelles sub-micrométriques : développements récents utilisant des faisceaux de rayons X focalisés UID:20180614T102554-a3133-e238@https://www.lps.u-psud.fr DTSTAMP:20180614T102554 DTSTART:20180618T140000 DTEND:20180618T150000 CREATED:20180614T102554 LAST-MODIFIED:20180614T102554 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Comportement mécanique aux échelles sub-micrométriques : développements récents utilisant des faisceaux de rayons X focalisés URL:https://www.lps.u-psud.fr/spip.php?article3133&id_evenement=238 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Theories of transport scaling in disordered semimetals and topological spin-nematic excitonic insulators in graphite under high magnetic field UID:20180615T154836-a3136-e240@https://www.lps.u-psud.fr DTSTAMP:20180615T154836 DTSTART:20180618T110000 DTEND:20180618T120000 CREATED:20180615T154836 LAST-MODIFIED:20180615T154944 LOCATION:Grand Amphi RDC @ LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Ryuichi Shindou DESCRIPTION:In the first part of my talk\, I will talk about transport scaling theories in disordered Weyl semimetal [1\,2]. In electronic band structure of solid state material\, two band touching points with linear dispersion (called as `Weyl node') appear in pair in the momentum space. When they annihilate with each other\, the system undergoes a quantum phase transition from Weyl semimetal (WSM) phase to a band insulator (BI) phase. The continuous phase transition is recently discovered in solid state materials [3]. The phase transition is described by a critical theory with a `magnetic dipole' like object in the momentum space. I will argue that the critical theory hosts a new disorder-driven quantum multicritical phenomena. Based on the renormalization group argument\, we clarify transport scaling properties around the Weyl node around the quantum multicritical point as well as the direct phase line between BI and WSM phases [1\,2]. In the second part of my talk\, I will argue that three-dimensional topological excitonic insulator is realized in graphite under high magnetic field [4\,5]. Graphite under high magnetic field exhibits consecutive metal-insulator (MI) transitions as well as re-entrant insulator-metal (IM) transition at low temperature. A part of the experiment was discovered more than 30 years ago\, while the identities of the low-temperature insulating phases are still unclear by now. We identify these enigmatic insulator phases with excitonic insulator phases\, where electron and hole pocket(s) form spin-triplet excitonic pairings. We show that the re-entrant IM transition in the graphite experiment can be naturally explained by an enhanced quantum spin fluctuation in the presence of smaller electron and hole pocket(s). We further argue that the odd-parity spin-triplet excitonic pairing reconstructs chiral surface Fermi arc state of electron and that of hole into a 2+1 massless surface Dirac fermion (topological excitonic insulator) [4\,5]. [1] https://arxiv.org/abs/1803.09051\, under review [2] https://arxiv.org/abs/1710.00572\, selected as PRB editors’ suggestion [3] Tian Liang\, et.al.\, Science Advances\, 3\, e1602510 (2017) [4] https://arxiv.org/abs/1802.10253\, under review [5] in preparation CATEGORIES:Theories of transport scaling in disordered semimetals and topological spin-nematic excitonic insulators in graphite under high magnetic field URL:https://www.lps.u-psud.fr/spip.php?article3136&id_evenement=240 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Séminaire Patrick Kékicheff UID:20180327T093452-a3109-e228@https://www.lps.u-psud.fr DTSTAMP:20180327T093452 DTSTART:20180615T110000 DTEND:20180615T120000 CREATED:20180327T093452 LAST-MODIFIED:20180327T093500 ORGANIZER;CN=Doru Constantin[:mailto:doru.constantin@u-psud.fr] CATEGORIES:Direct measurement of lateral correlations under controlled nanoconfinement : The long-range attraction between hydrophobic macroscopic surfaces URL:https://www.lps.u-psud.fr/spip.php?article3109&id_evenement=228 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Manipulation of interface-induced Skyrmions studied with STM UID:20180607T102006-a3132-e237@https://www.lps.u-psud.fr DTSTAMP:20180607T102006 DTSTART:20180612T150000 DTEND:20180612T160000 CREATED:20180607T102006 LAST-MODIFIED:20180607T102006 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Manipulation of interface-induced Skyrmions studied with STM URL:https://www.lps.u-psud.fr/spip.php?article3132&id_evenement=237 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Comparing a calculation to an experimental curve is one of the key issues when modelling a spectroscopy - Didier Sébilleau UID:20180604T095953-a3125-e236@https://www.lps.u-psud.fr DTSTAMP:20180604T095953 DTSTART:20180611T140000 DTEND:20180611T150000 CREATED:20180604T095953 LAST-MODIFIED:20180604T095953 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Comparing a calculation to an experimental curve is one of the key issues when modelling a spectroscopy - Didier Sébilleau URL:https://www.lps.u-psud.fr/spip.php?article3125&id_evenement=236 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Topological Phase Detection in Rashba Nanowires UID:20180528T222654-a3120-e235@https://www.lps.u-psud.fr DTSTAMP:20180528T222654 DTSTART:20180531T110000 DTEND:20180531T120000 CREATED:20180528T222654 LAST-MODIFIED:20180528T222706 LOCATION:Moyen Amphi RDC @ LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Denis Chevallier DESCRIPTION:We study the detection of the topological phase transition occurring in Rashba/Majorana nanowires with proximity-induced superconductivity using a quantum dot. The lowest in energy bulk states of such a nanowire have a spin polarization parallel or antiparallel to the applied magnetic field in the topological or trivial phase. We show that this property can be probed by the quantum dot created at the end of the nanowire by external gates. By tuning one of the two spin-split levels of the quantum dot to be in resonance with nanowire bulk states\, one can detect the spin polarization of the lowest band via transport measurement. Thus\, this allows us to determine the topological phase of the Rashba nanowire independently of the presence of the zero-energy Majorana bound states. Our work opens an entirely new path for experimental approaches to detect topological superconductivity. Our results demonstrate the feasibility of such measurements in realistic setups and thus provide a strong incentive for experimental implementations for many labs worldwide. Such experiments would be highly welcome by the community as they can provide independent support of topological phases\, and in this way help to resolve the controversy surrounding the interpretation of zero-bias peaks as Majorana bound states. CATEGORIES:Topological Phase Detection in Rashba Nanowires URL:https://www.lps.u-psud.fr/spip.php?article3120&id_evenement=235 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Synthetic spin orbit interaction for Majorana devices -Takis Kontos UID:20180522T154123-a3118-e234@https://www.lps.u-psud.fr DTSTAMP:20180522T154123 DTSTART:20180528T140000 DTEND:20180528T150000 CREATED:20180522T154123 LAST-MODIFIED:20180522T154123 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Synthetic spin orbit interaction for Majorana devices -Takis Kontos URL:https://www.lps.u-psud.fr/spip.php?article3118&id_evenement=234 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Superconductivity and pseudogap in cuprates : a tumultuous relationship UID:20180323T185635-a3107-e226@https://www.lps.u-psud.fr DTSTAMP:20180323T185635 DTSTART:20180524T110000 DTEND:20180524T120000 CREATED:20180323T185635 LAST-MODIFIED:20180425T111510 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Bastien Loret DESCRIPTION:Although high T c superconductivity has been discovered more than 29 years\,Automatic word wrap the mechanism of superconductivity is not yet understood and raises fundamentalAutomatic word wrap questions [1]. My talk will be focus on the link betwen superconductivity and theAutomatic word wrap pseudogap\, its origin remains mysterious. I will report our recent progress to grow single crystals of HgBa2Ca2Cu3O8 (Hg-1223) cuprate with a new self-ux growth technique. The crystals thus synthesized are submilimetric\, slightly underdoped and show high surface quality for spectroscopic measurements. Magnetometry and X-Ray diffraction have been performed. We show for the first time that with adequate heat treatment\, we can largely underdope the Hg-1223 compound and control its doping level [2]. Our raman spectroscopy study of a slightly underdoped single crystal of Hg-1223 allowed us to observe that the superconducting pair-breaking peak is associated with a dip on its higher-energy side\, disappearing together at T c . This result reveals a key aspect of the unconventional pairing mechanism : spectral weight lost in the dip is transferred to the pair-breaking peak at lower energies. This conclusion is supported by cellular dynamical mean-field theory on the Hubbard model\, which is able to reproduce all the main features of the Raman response and explain the peak-dip behavior in terms of a nontrivial relationship between the superconducting and the pseudogap [3]. We confirmed this result on others compounds revealing his universality. We tracked this structure with doping on Bi2Sr2CaCu2O8 [4]. The pseudogap survives in the overdoped region and then disappears above p 0.225\, which corresponds to the normal state disappearance of the pseudogap in coincidence with a Lifshitz transition. This suggests a vertical ending line of the pseudogap in the T-p phase diagram. CATEGORIES:Superconductivity and pseudogap in cuprates : a tumultuous relationship URL:https://www.lps.u-psud.fr/spip.php?article3107&id_evenement=226 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Conductance of Weyl semimetal nanowires UID:20180513T221514-a3117-e233@https://www.lps.u-psud.fr DTSTAMP:20180513T221514 DTSTART:20180517T110000 DTEND:20180517T120000 CREATED:20180513T221514 LAST-MODIFIED:20180514T134328 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Vardan Kaladzhyan DESCRIPTION:We study longitudinal magnetotransport in Weyl semimetal nanowires. We show that depending on radii of nanowires and magnetic field amplitudes there exist two different regimes. In the strong magnetic field regime (magnetic length much smaller than the radius of the nanowire)\, Landau level spectrum resembles that of a bulk Weyl semimetal\, and thus we obtain a conductance plateau for low chemical potentials due to the presence of the 0th chiral Landau level. On the contrary\, in the weak magnetic field regime (magnetic length much larger than the radius of the nanowire)\, the 0th LL is not chiral any more\, and therefore the conductance plateau at low chemical potentials disappears. We argue that both regimes are relevant for the ongoing experiments. CATEGORIES:Conductance of Weyl semimetal nanowires URL:https://www.lps.u-psud.fr/spip.php?article3117&id_evenement=233 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Thomas Séon UID:20180206T090302-a3096-e222@https://www.lps.u-psud.fr DTSTAMP:20180206T090302 DTSTART:20180504T110000 DTEND:20180504T120000 CREATED:20180206T090302 LAST-MODIFIED:20180216T121441 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:The physics of effervescence\, from bubble bursting to drop evaporation - Thomas Séon URL:https://www.lps.u-psud.fr/spip.php?article3096&id_evenement=222 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Higher-order topological insulators - Titus Neupert UID:20180410T094805-a3115-e232@https://www.lps.u-psud.fr DTSTAMP:20180410T094805 DTSTART:20180416T140000 DTEND:20180416T150000 CREATED:20180410T094805 LAST-MODIFIED:20180410T094805 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Higher-order topological insulators - Titus Neupert URL:https://www.lps.u-psud.fr/spip.php?article3115&id_evenement=232 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:FeSi : a novel building-block for iron-based superconductivity UID:20180403T110953-a3113-e230@https://www.lps.u-psud.fr DTSTAMP:20180403T110953 DTSTART:20180416T110000 DTEND:20180416T120000 CREATED:20180403T110953 LAST-MODIFIED:20180410T113107 LOCATION:salle 315 3eme étage\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Andres Cano DESCRIPTION:Iron-based superconductors represent the latest family of high-temperature unconventional superconductors [1]. In these systems\, the Fe atom is invariably associated to pnictogen (As\, P) or chalcogen (Se\, S\, Te) elements\, with the only and intensively debated exception of YFe2Ge2 [2\,3]. This circumstance raises the important fundamental question about the link between Fe-based superconductivity and the apparent need of these pnictogens and chalcogens [3]. At the same time\, to escape from such harmful and/or comparatively scarce As- or Se-like elements is highly desirable for applications. In the talk I will introduce the new material LaFeSiH\, which is first silicide that surpasses traditional pnictide and chalcogenide compounds as Fe-based superconductors\, and discuss some of its physical properties [4]. These include superconductivity with onset at 11 K\, and its coexistence with antiferromagnetic order and orthorhombic distortion already in the parent phase. [1] See e.g. H. Alloul and A. Cano (Guest Editors)\, Iron-based superconductors\, C. R. Physique 17\, 1 (2016) ; and the references therein. [2] J. Chen et al.\, Unconventional Superconductivity in the Layered Iron Germanide YFe2Ge2\, PRL 116\, 127001 (2016). [3] H. Kim et al.\, Crystal growth and annealing study of fragile\, non-bulk superconductivity in YFe2Ge2\, Phil. Mag. 95\, 804 (2015) ; D. Guterding et al.\, Nontrivial Role of Interlayer Cation States in Iron-Based Superconductors\, PRL 118\, 017204 (2017). [4] F. Bernardini\, G. Garbarino\, A. Sulpice\, M. Núñez-Regueiro\, E. Gaudin\, B. Chevalier\, A. Cano\, and S. Tencé\, Iron-based superconductivity extended to the novel silicide hydride LaFeSiH\, PRB 97 100504(R) (2018). CATEGORIES:FeSi : a novel building-block for iron-based superconductivity URL:https://www.lps.u-psud.fr/spip.php?article3113&id_evenement=230 SEQUENCE:2 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Semimetals Unlimited : Unbounded electrical and thermal transport properties in nodal semimetals UID:20180403T105223-a3112-e229@https://www.lps.u-psud.fr DTSTAMP:20180403T105223 DTSTART:20180410T140000 DTEND:20180410T150000 CREATED:20180403T105223 LAST-MODIFIED:20180403T172103 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Brian Skinner DESCRIPTION:Modern electronics is built on semiconductors\, whose utility comes from their ability to operate on either side of the conductor-insulator dichotomy. For practical applications\, however\, semiconductors face certain unavoidable limitations imposed by the physics of Anderson localization and by the disorder introduced through doping. In this talk I discuss whether these same limitations apply to nodal semimetals\, which are a novel class of three-dimensional materials that have a vanishing density of states (like insulators) but no gap to electron-hole excitations (like conductors). I show that\, surprisingly\, in a certain class of nodal semimetals the electronic mobility can far exceed the bounds that constrain doped semiconductors\, becoming divergingly large even with a finite concentration of charged impurities. I then discuss the thermoelectric effect in semimetals\, and show that their electron-hole symmetry allows for a thermopower that grows without bound under the application of a strong magnetic field. This large thermopower apparently enables the development of devices with record-large thermoelectric figure of merit. CATEGORIES:Semimetals Unlimited : Unbounded electrical and thermal transport properties in nodal semimetals URL:https://www.lps.u-psud.fr/spip.php?article3112&id_evenement=229 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Stabilizing zero temperature quantum phases and incompressible states of light via non-Markovian reservoir engineering - Jose Lebreuilly UID:20180410T094601-a3114-e231@https://www.lps.u-psud.fr DTSTAMP:20180410T094601 DTSTART:20180409T110000 DTEND:20180409T120000 CREATED:20180410T094601 LAST-MODIFIED:20180410T094601 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Stabilizing zero temperature quantum phases and incompressible states of light via non-Markovian reservoir engineering - Jose Lebreuilly URL:https://www.lps.u-psud.fr/spip.php?article3114&id_evenement=231 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Role of frustration and disorder in the competition between antiferromagnetism and quantum spin liquid of organic charge-transfer Mott insulators - Silvia Tomic UID:20180326T104804-a3108-e227@https://www.lps.u-psud.fr DTSTAMP:20180326T104804 DTSTART:20180405T100000 DTEND:20180405T110000 CREATED:20180326T104804 LAST-MODIFIED:20180326T104804 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Role of frustration and disorder in the competition between antiferromagnetism and quantum spin liquid of organic charge-transfer Mott insulators - Silvia Tomic URL:https://www.lps.u-psud.fr/spip.php?article3108&id_evenement=227 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Cécile Monteux UID:20170925T085409-a3015-e196@https://www.lps.u-psud.fr DTSTAMP:20170925T085409 DTSTART:20180323T110000 DTEND:20180323T120000 CREATED:20170925T085409 LAST-MODIFIED:20170925T085416 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Assembly of polymers and colloids at interfaces - Cécile Monteux URL:https://www.lps.u-psud.fr/spip.php?article3015&id_evenement=196 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:On-demand band structure modification in graphene/BN heterostructures by active angle control - Rebeca Ribeiro UID:20180312T095127-a3106-e225@https://www.lps.u-psud.fr DTSTAMP:20180312T095127 DTSTART:20180319T140000 DTEND:20180319T150000 CREATED:20180312T095127 LAST-MODIFIED:20180312T095127 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:On-demand band structure modification in graphene/BN heterostructures by active angle control - Rebeca Ribeiro URL:https://www.lps.u-psud.fr/spip.php?article3106&id_evenement=225 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Metallurgy of soft spheres : from BCC to Frank and Kasper phases… - Brigitte Pansu UID:20180128T195737-a3091-e221@https://www.lps.u-psud.fr DTSTAMP:20180128T195737 DTSTART:20180309T110000 DTEND:20180309T120000 CREATED:20180128T195737 LAST-MODIFIED:20180128T195958 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Metallurgy of soft spheres : from BCC to Frank and Kasper phases… - Brigitte Pansu URL:https://www.lps.u-psud.fr/spip.php?article3091&id_evenement=221 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Comportement mécanique aux échelles sub-micrométriques : développements récents utilisant des faisceaux de rayons X focalisés - Olivier Thomas UID:20180219T110249-a3105-e224@https://www.lps.u-psud.fr DTSTAMP:20180219T110249 DTSTART:20180307T103000 DTEND:20180307T113000 CREATED:20180219T110249 LAST-MODIFIED:20180219T110249 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:SEMINAIRE ANNULE : Comportement mécanique aux échelles sub-micrométriques : développements récents utilisant des faisceaux de rayons X focalisés - Olivier Thomas URL:https://www.lps.u-psud.fr/spip.php?article3105&id_evenement=224 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Imagining\, designing and realizing a Majorana qubit - Gerbold Ménard UID:20180213T110251-a3097-e223@https://www.lps.u-psud.fr DTSTAMP:20180213T110251 DTSTART:20180216T150000 DTEND:20180216T160000 CREATED:20180213T110251 LAST-MODIFIED:20180213T110251 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Imagining\, designing and realizing a Majorana qubit - Gerbold Ménard URL:https://www.lps.u-psud.fr/spip.php?article3097&id_evenement=223 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Comprehensive phase diagram of two-dimensional space charge doped Bi2Sr2CaCu2O8+x UID:20180123T041349-a3084-e218@https://www.lps.u-psud.fr DTSTAMP:20180123T041349 DTSTART:20180206T140000 DTEND:20180206T150000 CREATED:20180123T041349 LAST-MODIFIED:20180123T041634 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Edoardo Sterpetti DESCRIPTION:The phase diagram of hole-doped high critical temperature superconductors as a function of doping and temperature has been intensively studied with chemical variation of doping. Chemical doping can provoke structural changes and disorder\, masking intrinsic effects. Alternatively a field-effect transistor geometry with an electrostatically doped\, ultra-thin sample can be used. However to probe the phase diagram\, carrier density modulation beyond 1014cm-2 and transport measurements performed over a large temperature range are needed. Here we use the space charge doping method[1\,2] to measure transport characteristics from 330 K to low temperature. We extract parameters and characteristic temperatures over a large doping range and establish a comprehensive phase diagram for one unit cell thick Bi2Sr2CaCu2O8+x as a function of doping\, temperature and disorder[3] 1. Johan Biscaras et al.\, Nature Comm. 6\, 8826 (2015) 2. A. Paradisi et al.\, Applied Physics Letters 107\, 143103 (2015). 3. E.Sterpetti et al.\, Nature Comm. 8\, 2060 (2017) CATEGORIES:Comprehensive phase diagram of two-dimensional space charge doped Bi2Sr2CaCu2O8+x URL:https://www.lps.u-psud.fr/spip.php?article3084&id_evenement=218 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:ONDES GRAVITATIONNELLES UID:20180125T155609-a3079-e220@https://www.lps.u-psud.fr DTSTAMP:20180125T155609 DTSTART:20180201T133000 DTEND:20180201T150000 CREATED:20180125T155609 LAST-MODIFIED:20180125T155824 ORGANIZER;CN=Marie-France Mariotto[:mailto:mariotto@lps.u-psud.fr] ATTENDEE:Fabien Cavalier CATEGORIES:ONDES GRAVITATIONNELLES URL:https://www.lps.u-psud.fr/spip.php?article3079&id_evenement=220 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Exploring a quantum phase transition with a Kondo circuit - Anne Anthore UID:20180123T142741-a3085-e219@https://www.lps.u-psud.fr DTSTAMP:20180123T142741 DTSTART:20180129T103000 DTEND:20180129T113000 CREATED:20180123T142741 LAST-MODIFIED:20180123T142956 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Exploring a quantum phase transition with a Kondo circuit - Anne Anthore URL:https://www.lps.u-psud.fr/spip.php?article3085&id_evenement=219 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Pierre Colinet UID:20170503T133306-a2965-e169@https://www.lps.u-psud.fr DTSTAMP:20170503T133306 DTSTART:20180126T110000 DTEND:20180126T120000 CREATED:20170503T133306 LAST-MODIFIED:20171013T140443 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Evaporation of sessile droplets with moving contact lines - Pierre Colinet URL:https://www.lps.u-psud.fr/spip.php?article2965&id_evenement=169 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Berry phase and quantum metric for Bloch electrons UID:20171222T185219-a3075-e215@https://www.lps.u-psud.fr DTSTAMP:20171222T185219 DTSTART:20180125T103000 DTEND:20180125T113000 CREATED:20171222T185219 LAST-MODIFIED:20180121T224411 LOCATION:salle caffet theo\, 1er étage\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Jean-Noël Fuchs DESCRIPTION:In this talk\, I will try to answer the following question : what is the effective Hamiltonian describing a Bloch electron restricted to a single band\, but in in the presence of other bands and of external electromagnetic fields ? I will first review Peierls' answer involving the Peierls' substitution and leading to well-known semiclassical equations of motion (cf. Ashcroft-Mermin). Then I will argue that\, although this answer leads to many successes\, it is too naive as it only involves the band energy spectrum but completely forgets the corresponding eigenvectors. Eventually\, I will turn to the modern understanding – which goes back to Thouless\, Berry and Haldane – of the existence of a geometric structure hidden within band theory (namely a Berry phase and a quantum metric). This will allow us to derive a modified effective single-band Hamiltonian. The corresponding semiclassical equations of motion (cf. Qian Niu and collaborators) include extra terms such as the Karplus-Luttinger anomalous velocity and the orbital magnetic moment. If time permits\, I will end by showing how the quantum Hall effect appears in hindsight as electric transport in a peculiar band insulator in zero external magnetic field. CATEGORIES:Berry phase and quantum metric for Bloch electrons URL:https://www.lps.u-psud.fr/spip.php?article3075&id_evenement=215 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Isabelle Cantat UID:20170416T184121-a2957-e164@https://www.lps.u-psud.fr DTSTAMP:20170416T184121 DTSTART:20180119T110000 DTEND:20180119T120000 CREATED:20170416T184121 LAST-MODIFIED:20170905T085936 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Hydrodynamics in foam films - Isabelle Cantat URL:https://www.lps.u-psud.fr/spip.php?article2957&id_evenement=164 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Anomalous topological Floquet states UID:20171222T184425-a3074-e214@https://www.lps.u-psud.fr DTSTAMP:20171222T184425 DTSTART:20180111T110000 DTEND:20180111T120000 CREATED:20171222T184425 LAST-MODIFIED:20171222T184550 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Pierre Delplace DESCRIPTION:Since the discovery of the quantum spin Hall effect\, the search for novel topological insulating states has been stimulating tremendous efforts\, impacting many areas of physics beyond semi-conductors physics. In particular it was proposed\, and then observed in photonic lattices\, that specific periodic drives can lead to unusual dynamical topological states\, referred to as topological Floquet states. Whereas such driving protocols were first proposed to simply dynamically trigger a topological phase transition\, it was later realized that novel topological states\, with no equilibrium (or static) counterpart\, can be induced : the so-called anomalous topological Floquet states. More specifically\, the usual topological index used to account for the existence of boundary states\, namely the first Chern number\, vanishes\, and an other "dynamical" invariant must be used. In this seminar\, I will discuss the roles of two different symmetries in this context. First I will show how a Z2-valued dynamical invariant can be defined when the evolution operator is constrained by time-reversal symmetry\, thus generalizing the pioneering work by Kane and Mele to periodically driven systems. Then I will discuss the recently introduced "phase rotation symmetry" that was proposed to achieve anomalous states. CATEGORIES:Anomalous topological Floquet states URL:https://www.lps.u-psud.fr/spip.php?article3074&id_evenement=214 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Nanodevices for Bio-inspired Computing - Julie Grollier UID:20171011T100036-a3024-e202@https://www.lps.u-psud.fr DTSTAMP:20171011T100036 DTSTART:20171219T110000 DTEND:20171219T120000 CREATED:20171011T100036 LAST-MODIFIED:20171018T152859 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Nanodevices for Bio-inspired Computing - Julie Grollier URL:https://www.lps.u-psud.fr/spip.php?article3024&id_evenement=202 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Sylvie Cohen-Addad UID:20170611T221308-a2989-e183@https://www.lps.u-psud.fr DTSTAMP:20170611T221308 DTSTART:20171215T110000 DTEND:20171215T120000 CREATED:20170611T221308 LAST-MODIFIED:20170906T092031 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Playing with trapped gas species or elasticity to arrest coarsening in foams - Sylvie Cohen-Addad URL:https://www.lps.u-psud.fr/spip.php?article2989&id_evenement=183 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Non-conventional magnetic order in 3D UID:20171204T224318-a3072-e212@https://www.lps.u-psud.fr DTSTAMP:20171204T224318 DTSTART:20171214T110000 DTEND:20171214T120000 CREATED:20171204T224318 LAST-MODIFIED:20171204T225127 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Olga Petrova DESCRIPTION:Abstract : Exotic types of order that go beyond Landau's theory of spontaneous symmetry breaking continue to captivate the attention of condensed matter physicists. Using the language of spins often allows for construction of models that are analytically and/or numerically tractable\, yet still highly relevant to experiments. In the recent years\, much progress has been made in one and two dimensions\, which are particularly well-suited for a theoretical study. However\, there are two indisputable reasons to go beyond 2D : firstly\, most of the compounds surrounding us are\, in fact\, three dimensional. Second\, but no less important\, reason is that higher dimensions give rise to even richer and more exotic physical phenomena. One of the examples of exotic quantum order is the so-called topological phases. Originally proposed in two dimensions\, topological phases have ground state degeneracies that depend solely on the topology that the system is embedded in. This topological degeneracy of the ground state is directly linked to the existence of gapped excitations\, termed anyons\, whose exchange statistics are strikingly different from the familiar bosons and fermions. Pointlike anyons can only exist in two-dimensions\, however the concept of topological order has been extended beyond 2D via two main avenues : (a) introducing extended (e.g.\, loop-like) anyon excitations\, and (b) fracton topological order. The latter phases host pointlike excitations that are immobile : strictly localized in space. In my talk\, I will introduce a simple toy model with this type of order\, starting from a layered construction of two-dimensional toric codes. CATEGORIES:Non-conventional magnetic order in 3D URL:https://www.lps.u-psud.fr/spip.php?article3072&id_evenement=212 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Field induced states in the quantum limit of graphite - Benoit Fauqué UID:20171207T111133-a3073-e213@https://www.lps.u-psud.fr DTSTAMP:20171207T111133 DTSTART:20171213T110000 DTEND:20171213T120000 CREATED:20171207T111133 LAST-MODIFIED:20171207T111133 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Field induced states in the quantum limit of graphite - Benoit Fauqué URL:https://www.lps.u-psud.fr/spip.php?article3073&id_evenement=213 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:La loi de Stefan-Boltzmann et quelques remarques sur les origines de la mécanique quantique - Gilles Montambaux UID:20171120T104529-a3061-e210@https://www.lps.u-psud.fr DTSTAMP:20171120T104529 DTSTART:20171212T133000 DTEND:20171212T143000 CREATED:20171120T104529 LAST-MODIFIED:20171120T104529 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Généralisation de la loi de Stefan-Boltzmann et quelques remarques sur la naissance de la mécanique quantique - Gilles Montambaux URL:https://www.lps.u-psud.fr/spip.php?article3061&id_evenement=210 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Michiel Postema UID:20170712T172809-a3004-e192@https://www.lps.u-psud.fr DTSTAMP:20170712T172809 DTSTART:20171201T110000 DTEND:20171201T120000 CREATED:20170712T172809 LAST-MODIFIED:20170713T133834 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Bubbles and antibubbles for ultrasound-guided drug delivery - Michiel Postema URL:https://www.lps.u-psud.fr/spip.php?article3004&id_evenement=192 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:The Chiral Anomaly and Ballistic Transport of Weyl Fermions UID:20171115T103809-a3058-e209@https://www.lps.u-psud.fr DTSTAMP:20171115T103809 DTSTART:20171130T110000 DTEND:20171130T123000 CREATED:20171115T103809 LAST-MODIFIED:20171115T104503 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:David Carpentier DESCRIPTION:The chiral anomaly is a unique property of massless relativistic particles in three dimensions. While the chiral nature of particles was expected to be a conserved property\, the breaking of this symmetry was a bizarre property of the associated field theory. The recent focus on materials in which low energy electrons behave as massless relativistic Weyl particles has opened the possibility to experimentally access consequences on transport of this field theory property. Indeed\, an anomalous contribution to the conductance in the presence of a magnetic field was associated to the presence of the chiral anomaly. In this talk\, I will focus on the different regime of ballistic transport of Weyl fermions in small mesoscopic conductors. I will show how the anomalous transport can be traced back to the presence of anomalous Landau Levels in such a junction\, and to the chiral anomaly. I will finally comment on the relation between diffusive and ballistic regimes. CATEGORIES:The Chiral Anomaly and Ballistic Transport of Weyl Fermions URL:https://www.lps.u-psud.fr/spip.php?article3058&id_evenement=209 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Spin entanglement and current cross correlations in nonlinear current through Kondo correlated dot - Rui Sakano UID:20171123T100024-a3065-e211@https://www.lps.u-psud.fr DTSTAMP:20171123T100024 DTSTART:20171129T103000 DTEND:20171129T113000 CREATED:20171123T100024 LAST-MODIFIED:20171123T100024 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Spin entanglement and current cross correlations in nonlinear current through Kondo correlated dot - Rui Sakano URL:https://www.lps.u-psud.fr/spip.php?article3065&id_evenement=211 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Edition scientifique : un panorama des évolutions en cours - Karim Ramdani UID:20171031T151236-a3047-e205@https://www.lps.u-psud.fr DTSTAMP:20171031T151236 DTSTART:20171128T133000 DTEND:20171128T150000 CREATED:20171031T151236 LAST-MODIFIED:20171031T151236 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Edition scientifique : un panorama des évolutions en cours - Karim Ramdani URL:https://www.lps.u-psud.fr/spip.php?article3047&id_evenement=205 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Alesya Mikhailovskaya UID:20171026T104010-a3029-e203@https://www.lps.u-psud.fr DTSTAMP:20171026T104010 DTSTART:20171124T110000 DTEND:20171124T120000 CREATED:20171026T104010 LAST-MODIFIED:20171026T104016 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Experimental evidence of non-affine deformations in disordered materials - Alesya Mikhailovskaya URL:https://www.lps.u-psud.fr/spip.php?article3029&id_evenement=203 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Pascal Raux UID:20170710T213038-a3003-e191@https://www.lps.u-psud.fr DTSTAMP:20170710T213038 DTSTART:20171117T110000 DTEND:20171117T120000 CREATED:20170710T213038 LAST-MODIFIED:20170710T213108 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Liquid-grains interactions - Pascal Raux URL:https://www.lps.u-psud.fr/spip.php?article3003&id_evenement=191 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Biominéralisation & Calcifications Pathologiques : la belle et la bête UID:20171026T170955-a3030-e204@https://www.lps.u-psud.fr DTSTAMP:20171026T170955 DTSTART:20171116T133000 DTEND:20171116T150000 CREATED:20171026T170955 LAST-MODIFIED:20171026T173126 ORGANIZER;CN=Marie-France Mariotto[:mailto:mariotto@lps.u-psud.fr] ATTENDEE:D. Bazin et M. Daudon CATEGORIES:Biominéralisation & Calcifications Pathologiques : la belle et la bête URL:https://www.lps.u-psud.fr/spip.php?article3030&id_evenement=204 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:A Chiral Maxwell Demon UID:20171112T231944-a3057-e208@https://www.lps.u-psud.fr DTSTAMP:20171112T231944 DTSTART:20171116T110000 DTEND:20171116T120000 CREATED:20171112T231944 LAST-MODIFIED:20171112T232118 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Rosa Lopez DESCRIPTION:Maxwells demon is characterized by a hypothetical intelligence capable of sorting hot (fast) and cold (slow) atoms to left and right sub-cavities in a box by simply matchingly inserting and removing an impenetrable wall. This concept was suggested by J.C. Maxwell to highlight that thermodynamics is a macroscopic theory. Under ideal conditions\, inserting and removing the wall would not require work and the apparent contradiction with the second law the entropy in the box would be reduced and after the sorting process\, work could be extracted from the temperature difference between the sub-cavities has been a source of much debate ever since1. It is now generally believed that this paradox is overcome by the Landauer principle : Deleting the data required for the processing in the demons mind would at least generate entropy S = kBln2 or dissipate heat of at least Q = kBTln2 per bit of information\, yielding a net production of entropy. The demon measures on the system and conditioned on the measurement result it decides its action which is formally nothing but a closed-loop feed-back control scheme. Here\, we replace the two sub-cavities of the box by the magnetic field polarity that determines the chirality of the conducting channels. The chiral conductors are coupled to a quasilocalized level state. Depeneding on its occupation dynamics a nearby quantum point contact (QPC) choose one or other field polarity. In this manner the tunneling rates to the conductors are modified depending on the quasibound state occupation.In this work we will address the entropy production\, power production\, and efficiency when a magnetic feedback is considered. CATEGORIES:A Chiral Maxwell Demon URL:https://www.lps.u-psud.fr/spip.php?article3057&id_evenement=208 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Magnetic resonance at the quantum limit and beyond - Patrice Bertet UID:20171107T105933-a3053-e207@https://www.lps.u-psud.fr DTSTAMP:20171107T105933 DTSTART:20171115T103000 DTEND:20171115T120000 CREATED:20171107T105933 LAST-MODIFIED:20171107T105933 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Magnetic resonance at the quantum limit and beyond - Patrice Bertet URL:https://www.lps.u-psud.fr/spip.php?article3053&id_evenement=207 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Dark states and and transport spectroscopy in high purity carbon nanotubes - Christophe Strunk UID:20171031T153200-a3048-e206@https://www.lps.u-psud.fr DTSTAMP:20171031T153200 DTSTART:20171110T100000 DTEND:20171110T110000 CREATED:20171031T153200 LAST-MODIFIED:20171031T153200 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Dark states and and transport spectroscopy in high purity carbon nanotubes - Christophe Strunk URL:https://www.lps.u-psud.fr/spip.php?article3048&id_evenement=206 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Proximity-induced superconductivity in single and double Majorana nanowires UID:20171004T214322-a3023-e201@https://www.lps.u-psud.fr DTSTAMP:20171004T214322 DTSTART:20171019T110000 DTEND:20171019T120000 CREATED:20171004T214322 LAST-MODIFIED:20171004T214333 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Christopher Reeg DESCRIPTION:In this talk\, we will discuss various aspects of the superconducting proximity effect as it pertains to realizing topological superconductivity in both one- and two-nanowire systems. As experimental setups have moved almost exclusively toward inducing superconductivity in nanowires using a thin ( 10 nm thickness) layer of Al which forms a very strong contact\, we will first discuss the influence of the finite thickness of the superconductor on the proximity effect. We will show that due to the large level spacing in Al\, a large tunneling energy is required in order to reach the strong-coupling limit observed experimentally. However\, we also show that such strong coupling induces a large shift in the effective chemical potential of the nanowire which pushes the topological threshold to magnetic field strengths greatly exceeding the critical field of Al. Next\, we will show that intrawire and interwire pairing interfere destructively with one another in a double-nanowire system\, and that this destructive interference can be utilized to significantly reduce the magnetic field threshold required to reach the topological phase. We will also discuss how to engineer (effective) Kramers pairs of Majorana fermions in double nanowires when time-reversal symmetry is explicitly broken. CATEGORIES:Proximity-induced superconductivity in single and double Majorana nanowires URL:https://www.lps.u-psud.fr/spip.php?article3023&id_evenement=201 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Fête de la science 2017 UID:20171003T164622-a3020-e199@https://www.lps.u-psud.fr DTSTAMP:20171003T164622 DTSTART;VALUE=DATE:20171015 DTEND;VALUE=DATE:20171016 CREATED:20171003T164622 LAST-MODIFIED:20171003T164622 LOCATION:LPS \, Bt 510 Orsay ORGANIZER;CN=Marie-France Mariotto[:mailto:mariotto@lps.u-psud.fr] CATEGORIES:Fête de la science 2017 URL:https://www.lps.u-psud.fr/spip.php?article3020&id_evenement=199 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Fête de la science 2017 UID:20171003T164407-a3020-e198@https://www.lps.u-psud.fr DTSTAMP:20171003T164407 DTSTART;VALUE=DATE:20171013 DTEND;VALUE=DATE:20171014 CREATED:20171003T164407 LAST-MODIFIED:20171003T164407 ORGANIZER;CN=Marie-France Mariotto[:mailto:mariotto@lps.u-psud.fr] CATEGORIES:Fête de la science 2017 URL:https://www.lps.u-psud.fr/spip.php?article3020&id_evenement=198 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY: Interactions and disorder in topological superconducting wires UID:20171004T212211-a3021-e200@https://www.lps.u-psud.fr DTSTAMP:20171004T212211 DTSTART:20171012T110000 DTEND:20171012T120000 CREATED:20171004T212211 LAST-MODIFIED:20171004T212226 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Dganit Meidan DESCRIPTION:The prospects of building quantum devices based on topologically ordered states of matter has caused a great deal of excitement. In these systems\, emergent excitations known as Majorana zero modes that occur at sample edges obey non- Abelian exchange statistics\, and their manipulation is inherently protected from common sources of decoherence. While their existence is known to be reasonably stable to imperfect conditions such as impurities and weak electron- electron interactions\, aspirations to observe and manipulate Majorana zero-modes in proximity coupled systems requires a detailed study of both these effects. As a particular example we numerically study the effect of disorder on the stability of the many body zero mode in a Kitaev chain with local interactions. Our numerical procedure allows us to resolve the position-space and multi-particle structure of the zero modes\, as well as providing estimates for the mean energy splitting between pairs of states of opposite fermion parity\, over the full many body spectrum. We find that the parameter space of a clean system can be divided into regions where interaction induced decay transitions are suppressed (Region I) and where they are not (Region II). In Region I we observe that disorder has an adverse effect on the zero mode\, which extends further into the bulk and is accompanied by an increased energy splitting between pairs of states of opposite parity. Conversely Region II sees a more intricate effect of disorder showing an enhancement of localization at the system's end\, accompanied by a reduction in the mean pairwise energy splitting CATEGORIES: Interactions and disorder in topological superconducting wires URL:https://www.lps.u-psud.fr/spip.php?article3021&id_evenement=200 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Directed Self-Assembly of Plasmonic Colloids - Luis M. Liz-Marzán UID:20170926T144800-a3016-e197@https://www.lps.u-psud.fr DTSTAMP:20170926T144800 DTSTART:20171009T150000 DTEND:20171009T160000 CREATED:20170926T144800 LAST-MODIFIED:20170926T144800 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Directed Self-Assembly of Plasmonic Colloids - Luis M. Liz-Marzán URL:https://www.lps.u-psud.fr/spip.php?article3016&id_evenement=197 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY: Mechanical and Electrical sensing single cells using microfluidic devices - Bruno Le Pioufle UID:20170509T181139-a2967-e170@https://www.lps.u-psud.fr DTSTAMP:20170509T181139 DTSTART:20171006T110000 DTEND:20171006T120000 CREATED:20170509T181139 LAST-MODIFIED:20170920T093905 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES: Mechanical and Electrical sensing single cells using microfluidic devices - Bruno Le Pioufle URL:https://www.lps.u-psud.fr/spip.php?article2967&id_evenement=170 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Julien Derr UID:20170414T132956-a2956-e163@https://www.lps.u-psud.fr DTSTAMP:20170414T132956 DTSTART:20170929T110000 DTEND:20170929T120000 CREATED:20170414T132956 LAST-MODIFIED:20170414T133003 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Morphogenesis and Motions in Biological Systems - Julien Derr URL:https://www.lps.u-psud.fr/spip.php?article2956&id_evenement=163 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Contributing to the development of an academic department in Ethiopia - Raphaël Michel UID:20170428T135853-a2964-e168@https://www.lps.u-psud.fr DTSTAMP:20170428T135853 DTSTART:20170922T110000 DTEND:20170922T120000 CREATED:20170428T135853 LAST-MODIFIED:20170601T220053 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Adhesion of Nanoparticle-Coated Hydrogels to Living Tissues - Raphaël Michel URL:https://www.lps.u-psud.fr/spip.php?article2964&id_evenement=168 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Transport signatures of charge density wave order and the pseudogap critical point in cuprate superconductors - Sven Badoux UID:20170913T161804-a3013-e195@https://www.lps.u-psud.fr DTSTAMP:20170913T161804 DTSTART:20170920T103000 DTEND:20170920T113000 CREATED:20170913T161804 LAST-MODIFIED:20170913T161804 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Transport signatures of charge density wave order and the pseudogap critical point in cuprate superconductors - Sven Badoux URL:https://www.lps.u-psud.fr/spip.php?article3013&id_evenement=195 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Time-resolved X-ray diffraction studies of metallic coated InSb : application for X-ray switch and demonstration of high-pressure crystalline phase transition - Amélie Jarnac UID:20170905T131912-a3012-e194@https://www.lps.u-psud.fr DTSTAMP:20170905T131912 DTSTART:20170919T103000 DTEND:20170919T113000 CREATED:20170905T131912 LAST-MODIFIED:20170905T131912 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Time-resolved X-ray diffraction studies of metallic coated InSb : application for X-ray switch and demonstration of high-pressure crystalline phase transition - Amélie Jarnac URL:https://www.lps.u-psud.fr/spip.php?article3012&id_evenement=194 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:J. Techno 2017 UID:20170529T104226-a2917-e179@https://www.lps.u-psud.fr DTSTAMP:20170529T104226 DTSTART:20170915T093000 DTEND:20170915T130000 CREATED:20170529T104226 LAST-MODIFIED:20170529T104226 ORGANIZER;CN=Marie-France Mariotto[:mailto:mariotto@lps.u-psud.fr] ATTENDEE:J.Techno 2017 CATEGORIES:J. Techno 2017 URL:https://www.lps.u-psud.fr/spip.php?article2917&id_evenement=179 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:J. Techno 2017 UID:20170529T104000-a2917-e178@https://www.lps.u-psud.fr DTSTAMP:20170529T104000 DTSTART:20170914T140000 DTEND:20170914T170000 CREATED:20170529T104000 LAST-MODIFIED:20170529T104000 ORGANIZER;CN=Marie-France Mariotto[:mailto:mariotto@lps.u-psud.fr] ATTENDEE:J.Techno 2017 CATEGORIES:J. Techno 2017 URL:https://www.lps.u-psud.fr/spip.php?article2917&id_evenement=178 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Phase transitions in spin-crossover thin films probed by graphene transport measurements : towards smart heterostructures - Julien Dugay UID:20170905T131639-a3011-e193@https://www.lps.u-psud.fr DTSTAMP:20170905T131639 DTSTART:20170913T103000 DTEND:20170913T113000 CREATED:20170905T131639 LAST-MODIFIED:20170905T131639 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Phase transitions in spin-crossover thin films probed by graphene transport measurements : towards smart heterostructures - Julien Dugay URL:https://www.lps.u-psud.fr/spip.php?article3011&id_evenement=193 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:NMR Studies of Local Structure and Ion Transport in Lithium Battery Electrolytes - Steve Greenbaum UID:20170629T090833-a2996-e190@https://www.lps.u-psud.fr DTSTAMP:20170629T090833 DTSTART:20170711T110000 DTEND:20170711T120000 CREATED:20170629T090833 LAST-MODIFIED:20170629T090839 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:NMR Studies of Local Structure and Ion Transport in Lithium Battery Electrolytes - Steve Greenbaum URL:https://www.lps.u-psud.fr/spip.php?article2996&id_evenement=190 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Liquid crystalline colloids of inorganic nanosheets - Nobuyoshi Miyamoto UID:20170426T143324-a2963-e167@https://www.lps.u-psud.fr DTSTAMP:20170426T143324 DTSTART:20170707T110000 DTEND:20170707T120000 CREATED:20170426T143324 LAST-MODIFIED:20170606T183536 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Liquid crystalline colloids of inorganic nanosheets - Nobuyoshi Miyamoto URL:https://www.lps.u-psud.fr/spip.php?article2963&id_evenement=167 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Ivan Smalyukh UID:20170426T143158-a2962-e166@https://www.lps.u-psud.fr DTSTAMP:20170426T143158 DTSTART:20170630T110000 DTEND:20170630T120000 CREATED:20170426T143158 LAST-MODIFIED:20170426T143204 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Bacteria make liquid crystal colloids and gels - Ivan Smalyukh URL:https://www.lps.u-psud.fr/spip.php?article2962&id_evenement=166 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Design of Majorana Edge States in Topological Superconductors UID:20170619T002947-a2993-e187@https://www.lps.u-psud.fr DTSTAMP:20170619T002947 DTSTART:20170629T110000 DTEND:20170629T120000 CREATED:20170619T002947 LAST-MODIFIED:20170619T003032 LOCATION:Amphi Moyen\, RdC LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Dirk Morr DESCRIPTION:The experimental observation of Majorana bound states in topological superconductors represents a major breakthrough in realizing their applications in quantum computation. Recent proposals focusing on the creation of Majorana states on the edges of 2D magnetic (Shiba) islands have raised the question of whether Majorana states can be designed at the interface between complex magnetic structures and s-wave superconductors. In this talk\, I will demonstrate that it is possible to design Majorana modes by engineering the spatial and magnetic structure of Shiba islands located on the surface of s-wave superconductors. I show that by investigating the relation between local transport properties – as reflected in the spatial flow of charge – and global transport properties\, one can identify characteristic transport properties of Majorana modes\, such as a quantized conductance that is proportional to the Chern number. In addition\, I demonstrate that topological low-energy edge modes carry a supercurrent whose chirality reflects the sign of the Chern number. Finally\, I show that topological superconductors exhibit an uncon-ventional spatial structure of superconducting triplet correlations which can be both time reversal (TR) breaking and TR preserving within the same system. CATEGORIES:Design of Majorana Edge States in Topological Superconductors URL:https://www.lps.u-psud.fr/spip.php?article2993&id_evenement=187 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Photoinduced dynamics of electronic\, structural and magnetic order in transition metal oxides - Elsa Abreu UID:20170626T094528-a2995-e189@https://www.lps.u-psud.fr DTSTAMP:20170626T094528 DTSTART:20170628T140000 DTEND:20170628T150000 CREATED:20170626T094528 LAST-MODIFIED:20170626T094528 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Photoinduced dynamics of electronic\, structural and magnetic order in transition metal oxides - Elsa Abreu URL:https://www.lps.u-psud.fr/spip.php?article2995&id_evenement=189 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Effects of disorder on nonclassicality in many-body systems UID:20170619T001427-a2992-e186@https://www.lps.u-psud.fr DTSTAMP:20170619T001427 DTSTART:20170628T103000 DTEND:20170628T120000 CREATED:20170619T001427 LAST-MODIFIED:20170626T210226 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Debasis Sadhukhan DESCRIPTION:Quantum correlations have been shown to be useful resources for a variety of quantum information and computational tasks. Many-body systems constitute a natural ground for the physical realization of such quantum information protocols. However\, pure quantum systems are very rare in nature due to decoherence\, thermal fluctuations\, impurities\, etc. Thus\, disordered systems form one of the center stages of studies in many-body physics and often lead to counterintuitive yet appealing physical phenomena such as many-body localization\, disorder-induced order\, etc. From a quantum information theoretic perspective\, I will discuss several interesting phenomena in the realm of quenched disorder which include enhancement of quantum correlation length\, overcoming no-go theorems\, and enhanced disorder-induced order of entanglement under thermal fluctuations. In a similar spirit\, inhomogeneity also leads to generation of new phases in the system. Introduction of an alternating chemical potential in an 1D Fermi gas on a lattice develops a new phase compared to the same system with uniform chemical potential which can be characterized by quantum correlations present in the system. I will also talk about the trends of quantum correlations in such system\, under closed and open dynamics. Finally\, I will show that bipartite entanglement can be frozen over time with a proper choice of the many-body substrate\, which is in contact with the environment via a repetitive interaction. CATEGORIES:Effects of disorder on nonclassicality in many-body systems URL:https://www.lps.u-psud.fr/spip.php?article2992&id_evenement=186 SEQUENCE:2 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Glass transition at interfaces - Thomas Salez UID:20170422T174313-a2961-e165@https://www.lps.u-psud.fr DTSTAMP:20170422T174313 DTSTART:20170623T110000 DTEND:20170623T120000 CREATED:20170422T174313 LAST-MODIFIED:20170422T174321 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Glass transition at interfaces - Thomas Salez URL:https://www.lps.u-psud.fr/spip.php?article2961&id_evenement=165 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:SmB6 : Skyrme insulator on the brink of superconductivity UID:20170618T234540-a2991-e185@https://www.lps.u-psud.fr DTSTAMP:20170618T234540 DTSTART:20170623T110000 DTEND:20170623T120000 CREATED:20170618T234540 LAST-MODIFIED:20170618T234613 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Piers Coleman DESCRIPTION:SmB6\, an ultra-narrow gap insulator discovered more than 50 years ago\, poses a paradox. On the one hand\, current theory and some experiments indicate that SmB6 is likely a topological insulator. On the other hand\, this system has been long known to display a large linear specific heat[1] and recent dHvA measurements[2] suggest that it contains a Fermi surface which responds to the Lorentz force\, but is insulating. Optical measurements also reveal that this insulator is an AC conductor\, with a large ingap ac conductivity and also exhibits a thermal conductivity that is proportional to the applied field[3]\, a feature reminiscent of an unpinned vortex lattice. These paradoxical results\, if true\, suggest an very unusual kind of insulator. I'll argue that the apparent presence of a Fermi surface of nominally neutral quasiparticles which nevertheless respond to a Lorentz force requires broken Gauge invariance\, which normally would imply superconductivity. This leads us to propose the concept of a "Skyrme insulator" : a condensate with a Meissner stiffness which is nevertheless topologically unable to support the quantization of circulation. The Skyrme insulator theory allows us to understand the linear specific heat of SmB6 in terms of a neutral Majorana Fermi sea\, and the theory predicts that in a screened environment at below fields of order a Gauss\, SmB6 will develop a Meissner effect. REFERENCES : [1] K. Flachbart\, M. Reiffers\, and S. Janos\, Journal of Less Common Metals 88\, L11 (1982). [2] B. S. Tan\, et al\, Science 349\, 287 (2015). [3] N. J. Laurita\, et al\, Phys. Rev. B 94\, 165154 (2016). [4] S. Sebastian\, APS March meeting \, 1603.09681 (2016). [5 ]Onur Erten\, Po-Yao Chang\, Piers Coleman and Alexei Tsvelik\, arXiv 1701.XXXX to be published (2017). CATEGORIES:SmB6 : Skyrme insulator on the brink of superconductivity URL:https://www.lps.u-psud.fr/spip.php?article2991&id_evenement=185 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY: The anomalous de Haas-van Alphen effect and Excitons in a topological Kondo insulator UID:20170619T113414-a2994-e188@https://www.lps.u-psud.fr DTSTAMP:20170619T113414 DTSTART:20170622T110000 DTEND:20170622T123000 CREATED:20170619T113414 LAST-MODIFIED:20170620T002727 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Johannes Knolle DESCRIPTION:The de Haas-van Alphen effect\, describing oscillations of the magnetization as a function of magnetic field\, is commonly assumed to be a definite sign for the presence of a Fermi surface (FS) in a metal. Here we show that\, in contrast to this canonical situation\, there can be quantum oscillations even for insulators of certain types. We draw connections to recent experiments on the topological Kondo insulator (TKI) candidate SmB6. In addition\, we show that TKIs are susceptible to the formation of bound electron-hole pairs. These excitons can account for long-standing thermodynamic and recent transport anomalies in SmB6 which is crucial for the identification of bulk topological signatures. CATEGORIES:The anomalous de Haas-van Alphen effect and Excitons in a topological Kondo insulator URL:https://www.lps.u-psud.fr/spip.php?article2994&id_evenement=188 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Alban Sauret UID:20161004T080547-a2845-e126@https://www.lps.u-psud.fr DTSTAMP:20161004T080547 DTSTART:20170616T110000 DTEND:20170616T120000 CREATED:20161004T080547 LAST-MODIFIED:20170414T091942 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Interfacial effects in fluid-particles systems - Alban Sauret URL:https://www.lps.u-psud.fr/spip.php?article2845&id_evenement=126 SEQUENCE:2 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Helical gaps in interacting Rashba wires UID:20170611T231619-a2990-e184@https://www.lps.u-psud.fr DTSTAMP:20170611T231619 DTSTART:20170615T110000 DTEND:20170615T120000 CREATED:20170611T231619 LAST-MODIFIED:20170611T231633 LOCATION:salle 208a\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Thomas SCHMIDT DESCRIPTION:A partially gapped spectrum due to the application of a magnetic field is one of the main probes of Rashba spin-orbit coupling in nanowires. Such a "helical gap" manifests itself in the linear conductance\, as well as in dynamic response functions such as the spectral function\, the structure factor\, or the tunneling density of states. We will present results about the signature of the helical gap in these observables with a particular focus on the interplay between Rashba spin-orbit coupling and electron-electron interactions. In a quasi-one-dimensional wire\, interactions can open a helical gap even without magnetic field. To show how the two types of helical gaps\, caused by magnetic fields or interactions\, can be distinguished in experiments\, we will present the dynamic response functions calculated using bosonization\, a renormalization group analysis\, and the exact form factors of the emerging sine-Gordon model. For special interaction strengths\, the results can be verified by refermionization. The helical gap typically occurs at low electron densities where the Coulomb energy dominates over the kinetic energy. To address this strongly correlated limit\, we have also investigated Rashba wires using Wigner crystal theory. To interplay of Rashba spin-orbit coupling and a magnetic field then leads to an effective spiral magnetic field. We show that helical gap exists even in the limit of strong interactions but its dependence on electron density differs significantly from the weakly interacting case. CATEGORIES:Helical gaps in interacting Rashba wires URL:https://www.lps.u-psud.fr/spip.php?article2990&id_evenement=184 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:From molecules to graphene\, new opportunities for spintronics beyond conventional materials - Pierre Seneor UID:20170606T103017-a2988-e182@https://www.lps.u-psud.fr DTSTAMP:20170606T103017 DTSTART:20170614T103000 DTEND:20170614T113000 CREATED:20170606T103017 LAST-MODIFIED:20170606T103017 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:From molecules to graphene\, new opportunities for spintronics beyond conventional materials - Pierre Seneor URL:https://www.lps.u-psud.fr/spip.php?article2988&id_evenement=182 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Particle and Droplets at Nanostructured Interfaces : Metastability and Thermally Activated Dynamics - Carlos Colosqui UID:20170605T073556-a2987-e181@https://www.lps.u-psud.fr DTSTAMP:20170605T073556 DTSTART:20170609T110000 DTEND:20170609T120000 CREATED:20170605T073556 LAST-MODIFIED:20170605T073602 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Particles and Droplets at Nanostructured Interfaces : Metastability and Thermally Activated Dynamics - Carlos Colosqui URL:https://www.lps.u-psud.fr/spip.php?article2987&id_evenement=181 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Electronic structure of 2D materials and van der Waals heterostructures probed at the nanoscale - Pierre Mallet UID:20170529T095722-a2983-e176@https://www.lps.u-psud.fr DTSTAMP:20170529T095722 DTSTART:20170607T103000 DTEND:20170607T113000 CREATED:20170529T095722 LAST-MODIFIED:20170529T095722 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Electronic structure of 2D materials and van der Waals heterostructures probed at the nanoscale - Pierre Mallet URL:https://www.lps.u-psud.fr/spip.php?article2983&id_evenement=176 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Evolution of spectral and transport quantities with doping in the SU(2) theory of cuprates UID:20170514T225720-a2973-e174@https://www.lps.u-psud.fr DTSTAMP:20170514T225720 DTSTART:20170601T110000 DTEND:20170601T123000 CREATED:20170514T225720 LAST-MODIFIED:20170523T234322 LOCATION:salle 315\, aîle sud LPS\, bât 510 ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Corentin Morice DESCRIPTION:Recent transport experiments in the cuprate superconductors shed new light on the connection between the enigmatic pseudogap phase and the evolution of the electronic dispersion under doping. The latter is known to evolve from Fermi arcs measured by ARPES in the underdoped regime\, to a large hole Fermi surface at high doping\, as seen e.g. in quantum oscillation measurements. Combined Hall number and resistivity measurements at high magnetic field showed that the carrier density sharply changes from p to 1+p at the pseudogap critical doping p*\, linking the opening of the pseudogap to a change in electronic dispersion. The SU(2) theory of cuprates shows that antiferromagnetic short range interactions cause the arising of both charge and superconducting orders\, which are related by an SU(2) symmetry. The fluctuations associated with this symmetry form a pseudogap phase\, which was shown to account for Raman\, ARPES and strange metal experimental evidence. We derived the renormalized electronic propagator under the SU(2) dome\, and calculated the spectral functions and transport quantities of the renormalized bands. We show that their evolution with doping matches both spectral and transport measurements. CATEGORIES:Evolution of spectral and transport quantities with doping in the SU(2) theory of cuprates URL:https://www.lps.u-psud.fr/spip.php?article2973&id_evenement=174 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Generating spin currents in germanium using spin-orbit coupling - Matthieu Jamet UID:20170529T110351-a2984-e180@https://www.lps.u-psud.fr DTSTAMP:20170529T110351 DTSTART:20170531T140000 DTEND:20170531T150000 CREATED:20170529T110351 LAST-MODIFIED:20170529T110351 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Generating spin currents in germanium using spin-orbit coupling - Matthieu Jamet URL:https://www.lps.u-psud.fr/spip.php?article2984&id_evenement=180 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Artificial magnets as model systems : from the fragmentation of magnetization to the square ice model UID:20170529T095922-a2982-e177@https://www.lps.u-psud.fr DTSTAMP:20170529T095922 DTSTART:20170530T140000 DTEND:20170530T153000 CREATED:20170529T095922 LAST-MODIFIED:20170529T101109 LOCATION:Salle de réunion 208aAutomatic word wrap 2ème Sud ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Benjamin Canals DESCRIPTION:Complex architectures of nanostructures are routinely elaborated using bottom-up or nanofabrication processes. This technological capability allows scientists to engineer materials with properties that do not exist in nature\, but also to manufacture model systems to explore fundamental issues which appeared in condensed matter physics. One- and two-dimensional frustrated arrays of magnetic nanostructures are one class of systems for which theoretical predictions can now be tested and challenged experimentally. These systems have been the subject of intense research in the last few years and have allowed the investigation of a rich physics and fascinating phenomena\, such as the exploration of the extensively degenerate ground-state manifolds of spin ice systems\, the evidence of new magnetic phases in purely two-dimensional lattices\, and the observation of pseudo-excitations involving classical analogues of magnetic charges. This talk aims at providing two examples of two-dimensional artificial magnets which allow to probe the low energy manifolds of two exotic Ising systems. The first one is related to the seminal 6-vertex model and shows that it is possible to perform a scan through the 6-vertex model phase diagram with an appropriately designed artificial magnet [1]. In particular\, the symmetric point of the (Lieb) square ice is recovered\, providing with the opportunity to study the signatures of an algebraic Coulomb spin liquid. Because of the experimental procedure used to reach the low energy manifold\, quasi-particles are trapped in this disordered manifold\, pointing to the need of thermal systems\, but also emphasizing that these systems may be well suited to study out of equilibrium relaxation of monopole-(anti)monopole pairs in a near future. The second one refers to a recent proposal\, the fragmentation of magnetisation [2]\, in an Ising Kagomé model. Here\, we show it is possible to observe this intriguing phenomena\, which corresponds to the splitting of the local degree of freedom into two channels\, one ordering at low effective temperatures\, in an AF all-in all-out ordering despite the ferromagnetic nature of the system\, the other\, building a Coulomb-like low energy manifold\, inside which the magnetic equivalent of the Kirchhoff law at each node of the Kagomé lattice is fulfilled [3]. [1] Y. Perrin\, B. Canals\, N. Rougemaille\, Nature 540\, 410–413 (2016). [2] M. E. Brooks-Bartlett\, S. T. Banks\, L. D. C. Jaubert\, A. Harman-Clarke\, and P. C. W. Holdsworth\, Phys. Rev. X\, 4\, 011007 (2014). [3] B. Canals\, I. A. Chioar\, V.-D. Nguyen\, M. Hehn\, D. Lacour\, F. Montaigne\, A. Locatelli\, T. O. Mentes\, B. S. Burgos and N. Rougemaille\, Nat. Comm. 7\, 11446 (2016). CATEGORIES:Artificial magnets as model systems : from the fragmentation of magnetization to the square ice model URL:https://www.lps.u-psud.fr/spip.php?article2982&id_evenement=177 SEQUENCE:1 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Gap opening in graphene on nanostructured SiC and vicinal noble metal surfaces - Arlensiú CELIS UID:20170510T161513-a2968-e172@https://www.lps.u-psud.fr DTSTAMP:20170510T161513 DTSTART:20170524T103000 DTEND:20170524T113000 CREATED:20170510T161513 LAST-MODIFIED:20170510T161513 ORGANIZER;CN=HOARAU [:mailto:hoarau@lps.u-psud.fr] CATEGORIES:Gap opening in graphene on nanostructured SiC and vicinal noble metal surfaces - Arlensiú CELIS URL:https://www.lps.u-psud.fr/spip.php?article2968&id_evenement=172 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Superconductivity in Weyl metals. UID:20170514T234856-a2974-e175@https://www.lps.u-psud.fr DTSTAMP:20170514T234856 DTSTART:20170523T110000 DTEND:20170523T123000 CREATED:20170514T234856 LAST-MODIFIED:20170514T235806 LOCATION:Salle de réunion 315 3ème Sud ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Alexander Zyuzin DESCRIPTION:We report on a study of intrinsic superconductivity in a doped Weyl semimetal. We find that\, in an inversion-symmetric Weyl metal\, the odd-parity BCS state has a lower energy than the FFLO state\, despite the nodes in the gap. The FFLO state\, on the other hand\, may have a lower energy in a noncentrosymmetric Weyl metal\, in which Weyl nodes of opposite chirality have different energy. However\, realizing the FFLO state is\, in general\, very difficult since the paired states are not related by any exact symmetry\, which precludes a weak-coupling superconducting instability. We also discuss some of the physical properties of the nodal BCS state\, in particular\, Majorana and Fermi arc surface states. CATEGORIES:Superconductivity in Weyl metals. URL:https://www.lps.u-psud.fr/spip.php?article2974&id_evenement=175 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:- Clémence Le Coeur UID:20170310T172803-a2924-e158@https://www.lps.u-psud.fr DTSTAMP:20170310T172803 DTSTART:20170519T110000 DTEND:20170519T120000 CREATED:20170310T172803 LAST-MODIFIED:20170310T173052 ORGANIZER;CN=François Boulogne[:mailto:boulogne@lps.u-psud.fr] CATEGORIES:Formation of Poly(methacrylic acid) (PMAA) physical gels\, effect of temperature and shear. - Clémence Le Coeur URL:https://www.lps.u-psud.fr/spip.php?article2924&id_evenement=158 SEQUENCE:0 STATUS:CONFIRMED END:VEVENT BEGIN:VEVENT SUMMARY:Non-equilibrium superconductivity in driven alkali-doped fullerides UID:20170514T222120-a2972-e173@https://www.lps.u-psud.fr DTSTAMP:20170514T222120 DTSTART:20170518T110000 DTEND:20170518T120000 CREATED:20170514T222120 LAST-MODIFIED:20170514T223247 LOCATION:Salle de réunion 208a\, 2eme étage aîle sud ORGANIZER;CN=civelli[:mailto:marcello.civelli@u-psud.fr] ATTENDEE:Giacomo Mazza DESCRIPTION:The optical stimulation of solids by means of strong light pulses has opened new routes for the investigation of collective phenomena in quantum materials. In this talk I will consider the remarkable case of the experimental observations of a superconducting-like response in light-stimulated organic compound K3C60 above the equilibrium critical temperature [1]. In particular\, I will discuss the non-equilibrium properties of a minimal multi-orbital model describing strongly correlated superconductivity in alkali-doped fullerides [2]. Following a recent theoretical proposal for superconductivity boosting in A3C60 systems [3]\, I will consider an orbital- and time- dependent modulation of the on-site interaction energies. I will show that this leads to the formation of a transient non-equilibrium superconducting state which survives much beyond the equilibrium critical temperature Tc and whose properties are strongly different from what expected by equilibrium considerations. I will show that this leads to a regime in which the driving induces a transient superconductive state beyond the equilibrium critical temperature while suppressing superconductivity for T