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 . 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.
Keywords
Cite
@article{arxiv.2101.07201,
title = {Rise and Fall of Landau's Quasiparticles While Approaching the Mott Transition},
author = {Andrej Pustogow and Yohei Saito and Anja Löhle and Miriam Sanz Alonso and Atsushi Kawamoto and Vladimir Dobrosavljević and Martin Dressel and Simone Fratini},
journal= {arXiv preprint arXiv:2101.07201},
year = {2021}
}
Comments
Main part: 8 pages, 4 figures; Supplement: 8 pages, 11 figures