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Rise and Fall of Landau's Quasiparticles While Approaching the Mott Transition

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arxiv 2101.07201 v1 pith:EHBZITGT submitted 2021-01-18 cond-mat.str-el

classification cond-mat.str-el
keywords metalsmottopticalquasiparticlesapproachingfermi-liquidlandauresponse
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abstract

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 $m^{\star}$. 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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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Universal relation between residual resistivity and A coefficient in correlated metals

    cond-mat.str-el 2025-08 conditional novelty 7.0 of 10

    Residual resistivity in correlated metals contains a term proportional to the Fermi-liquid A coefficient: rho0 = rho00 + (3/4 pi^2) A sigma_mu^2, where sigma_mu is the variance of local chemical-potential fluctuations.

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