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DTSTART;TZID=Europe/Paris:20220613T140000
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SUMMARY:Emmanouil Frantzeskakis I “V2O3 : A direct view of changes in its electronic structure across the metal-to-insulator transition”
DESCRIPTION:\nEmmanouil Frantzeskakis (ISMO), Université Paris Saclay\n\n\n\nIn V2O3, the formal configuration of the vanadium ions is V+3[3d2]. Thus, as its conduction\n\n\n\nband is partially filled, according to band theory, this oxide should be a metal. However, V2O3shows a first-order metal-to-insulator transition (MIT) when cooling below T ~ 160 K, with anabrupt resistivity change of 7 orders of magnitude, accompanied by a corundum-tomonoclinicstructural transition and a paramagnetic to antiferromagnetic transition. In fact,the partially filled d-bands of V2O3 are prone to strong electron interactions, neglected in bandtheory. Hence, V2O3 is considered an archetype of the Mott MIT, one of the most fundamentalphenomena of electron correlations. However, after 50 years of research, the microscopicmechanism behind the Mott MIT is still controversial [1-4].In this talk, I will review our recent experimental results on V2O3 thin films by means of AngleResolved PhotoEmission Spectroscopy (ARPES). I will argue that we have for the first timesucceeded to measure the electronic structure changes of V2O3 across the MIT. The clearspectroscopic fingerprints give new important insight to the underlying mechanism of thisparadigmatic Mott transition [5].Time permitting, I will present further ARPES results on another hotly debated quantumsystem: the heavy-fermion compound URu2Si2. Its transition below 17 K into a quantum phasewith an unknown order parameter has sparked the interest of the condensed mattercommunity in the last 40 years [6-8]. We aim to shed new light into this so-called hidden orderphase by comparing the corresponding experimental electronic structure with the electronicstructure of the same compound in well-known quantum phases [9].\n\n\n\n[1] D B. McWhan et al., Phys. Rev. Lett. 23, 1384 (1969).[2] M. Imada, A. Fujimori, and Y. Tokura, Rev. Mod. Phys. 70, 1039 (1998).[3] M. J. Rozenberg et al., Phys. Rev. Lett. 75, 105 (1995).[4] A. I. Poteryaev et al., Phys. Rev. B 76, 085127 (2007).[5] M. Thees et al., Science Advances 7, eabj 1161 (2021).[6] M. B. Maple et al., Phys. Rev. Lett. 56, 185 (1986).[7] T. T. M. Palstra et al., Phys. Rev. Lett. 55, 2727 (1985).[8] J. A. Mydosh et al., Rev. Mod. Phys. 83, 1301 (2011).[9] E. Frantzeskakis et al., PNAS 118, e2020750118 (2021).\n
URL:https://www.lps.u-psud.fr/events/emmanouil-frantzeskakis-i-v2o3-a-direct-view-of-changes-in-its-electronic-structure-across-the-metal-to-insulator-transition/
CATEGORIES:Séminaire Matière Quantique (SMQ),Séminaires
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