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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20211108T140000
DTEND;TZID=Europe/Paris:20211108T180000
DTSTAMP:20211019T094200
UID:MEC-f35a2bc72dfdc2aae569a0c7370bd7f5@lps.u-psud.fr
CREATED:20211019
LAST-MODIFIED:20211025
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Michele CASULA, Manipulating Dirac states by varying the strength of electron correlations in BaNi(Co)S_2
DESCRIPTION:\nMichele Casula, UPMC\n\n\n\nAfter having been considered as a potential candidate for high-temperature superconductivity, the BaNi(Co)S_2 compound has seen renewed attention for its topological properties. BaNiS_2 is a Dirac semimetal, with 4 Dirac cones lying at the Fermi level, protected by the non-symmorphic symmetry and generated by an inversion mechanism triggered by a strong p-d hybridization.  We show that these cones can be effectively tuned by doping the compound through Co/Ni substitution [1], or by photo-exciting it [2]. By theoretical analysis and numerical modelization, we explain how chemical substitution and photo-excitation change its correlation strength. BaNi_xCo_{1-x}S_2 Dirac semimetal undergoes a transition at x=0.2 towards a strongly correlated insulating phase, while the non-equilibrium modifications of the Dirac bands are triggered by nontrivial band shifts mainly induced by the Fock term and by a change of the screening properties in the system [3]. The mechanisms unveiled in BaNi(Co)S_2 could guide the search of other tunable Dirac materials.\n\n\n\n[1] Niloufar Nilforoushan, Michele Casula, Adriano Amaricci, Marco Caputo, Jonathan Caillaux, Lama Khalil, Evangelos Papalazarou, Pascal Simon, Luca Perfetti, Ivana Vobornik, Pranab Kumar Das, Jun Fujii, Alexei Barinov, David Santos-Cottin, Yannick Klein, Michele Fabrizio, Andrea Gauzzi, and Marino Marsi, PNAS 118, 33 (2021).[2] N. Nilforoushan, M. Casula, M. Caputo, E. Papalazarou, J. Caillaux, Z. Chen, L. Perfetti,  A. Amaricci, D. Santos-Cottin, Y. Klein, A. Gauzzi, and M. Marsi, Photoinduced renormalization and electronic screening of quasi-two-dimensional Dirac states in BaNiS2, Phys. Rev. Research 2, 043397 (2020).[3] Nikolaj Bittner, Denis Golež, Michele Casula, and Philipp Werner, Photoinduced Dirac-cone flattening in BaNiS2, Phys. Rev. B 104, 115138 (2021).\n
URL:https://www.lps.u-psud.fr/events/michele-casula-upmc-3/
CATEGORIES:Séminaire Matière Quantique (SMQ),Séminaires
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