Rise and Fall of Landau's Quasiparticles While Approaching the Mott Transition
| Autor: | Pustogow, Andrej, Saito, Yohei, Löhle, Anja, Alonso, Miriam Sanz, Kawamoto, Atsushi, Dobrosavljević, Vladimir, Dressel, Martin, Fratini, Simone |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Nature Communications 12, 1571 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41467-021-21741-z |
| Popis: | 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. Comment: Main part: 8 pages, 4 figures; Supplement: 8 pages, 11 figures |
| Databáze: | arXiv |
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