March 10, 2021

New Article in Nature Communications: Rise and fall of Landau´s quasiparticles while approaching the Mott transition

A. Pustogow, Y. Saito, A. Löhle, M. Sanz Alonso, A. Kawamoto, V. Dobrosavljević, M. Dressel, S. Fratini

physicsworld published an article about our publication in Nature Communications:

  • Transport properties
  • Research update

12 Apr 2021 Isabelle Dumé


Please read the article:

How do good metals go bad?

New measurements have solved a mystery in solid state physics: How is it that certain metals do not seem to adhere to the valid rules?

https://www.tuwien.at/en/tu-wien/news/press-releases/news/wie-werden-gute-metalle-schlecht

New Article in Nature Communications: Rise and fall of Landau´s quasiparticles while approaching the Mott transition

https://www.nature.com/articles/s41467-021-21741-z
 
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.
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