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Article Dans Une Revue Nature Communications Année : 2021

Rise and fall of Landau’s quasiparticles while approaching the Mott transition

Résumé

Landau suggested that the low-temperature properties of metals can be understood in terms of long-lived quasiparticles with all complex interactions included in Fermi-liquid parameters, such as the effective mass m ⋆. Despite its wide applicability, electronic transport in bad or strange metals and unconventional superconductors is controversially discussed towards a possible collapse of the quasiparticle concept. Here we explore the electrodynamic response of correlated metals at half filling for varying correlation strength upon approaching a Mott insulator. We reveal persistent Fermi-liquid behavior with pronounced quadratic dependences of the optical scattering rate on temperature and frequency, along with a puzzling elastic contribution to relaxation. The strong increase of the resistivity beyond the Ioffe-Regel-Mott limit is accompanied by a 'displaced Drude peak' in the optical conductivity. Our results, supported by a theoretical model for the optical response, demonstrate the emergence of a bad metal from resilient quasiparticles that are subject to dynamical localization and dissolve near the Mott transition.
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Dates et versions

hal-03411886 , version 1 (02-11-2021)

Identifiants

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Andrej Pustogow, Yohei Saito, Anja Löhle, Miriam Sanz Alonso, Atsushi Kawamoto, et al.. Rise and fall of Landau’s quasiparticles while approaching the Mott transition. Nature Communications, 2021, 12, pp.1571. ⟨10.1038/s41467-021-21741-z⟩. ⟨hal-03411886⟩

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