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

Andrej Pustogow (), Yohei Saito, Anja Löhle, Miriam Sanz Alonso, Atsushi Kawamoto, Vladimir Dobrosavljević, Martin Dressel () and Simone Fratini ()
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Andrej Pustogow: Universität Stuttgart
Yohei Saito: Universität Stuttgart
Anja Löhle: Universität Stuttgart
Miriam Sanz Alonso: Universität Stuttgart
Atsushi Kawamoto: Hokkaido University
Vladimir Dobrosavljević: Florida State University
Martin Dressel: Universität Stuttgart
Simone Fratini: Institut Néel - CNRS and Université Grenoble Alpes

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: 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 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.

Date: 2021
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DOI: 10.1038/s41467-021-21741-z

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