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

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^⋆. 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

SUBMITTER: Pustogow A 

PROVIDER: S-EPMC7977040 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature