Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-21741-z
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [DR228/39-3, DR228/41-1, DR228/48-1, DR228/52-1]
- Alexander von Humboldt-Foundation through the Feodor Lynen Fellowship
- NSF [1822258]
- National High Magnetic Field Laboratory through the NSF [1157490]
- State of Florida
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1822258] Funding Source: National Science Foundation
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This study reveals the persistent Fermi-liquid behavior in correlated metals at half filling for varying correlation strength upon approaching a Mott insulator, showing pronounced quadratic dependences and a puzzling elastic contribution. The emergence of a bad metal from resilient quasiparticles near the Mott transition is demonstrated, supported by a theoretical model for the optical response.
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.
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