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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20230511T110000
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DTSTAMP:20230504T085300
UID:MEC-4e46e93a054f94c059e1fa4701f5a892@lps.u-psud.fr
CREATED:20230504
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SUMMARY:L.DE MEDICI:Mott Quantum Critical Points at Finite Doping
DESCRIPTION:\n We demonstrate that a finite-doping quantum critical point (QCP) naturally descends from the existence of a first-order Mott transition in the phase diagram of a strongly correlated material. In a prototypical case of a first-order Mott transition the surface associated with the equation of state for the homogeneous system is ”folded” so that in a range of parameters stable metallic and insulating phases exist and are connected by an unstable metallic branch.\n\nWe show that tuning the chemical potential causes the zero-temperature equation of state to gradually unfold. Under general conditions, we find that the Mott transition evolves into a first-order transition between two metals, associated to a phase separation region ending in the finite-doping QCP. This scenario is demonstrated by solving a simple multi-orbital Hubbard model relevant for the Iron-based superconductors, but its origin - the splitting of the atomic ground state multiplet by a small energy scale, here Hund’s coupling - is much more general. A strong analogy with cuprate superconductors is traced. \n\n\n[1] Chatzieleftheriou et al., Phys. Rev. Lett. 130, 066401 (2023).\n\n
URL:https://www.lps.u-psud.fr/en/events/l-de-medicimott-quantum-critical-points-at-finite-doping/
CATEGORIES:Condensed Matter Theory Seminar
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