How Bad Metals Turn Good: Spectroscopic Signatures of Resilient Quasiparticles

Xiaoyu Deng, Jernej Mravlje, Rok Žitko, Michel Ferrero, Gabriel Kotliar, and Antoine Georges
Phys. Rev. Lett. 110, 086401 – Published 19 February 2013
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Abstract

We investigate transport in strongly correlated metals. Within dynamical mean-field theory, we calculate the resistivity, thermopower, optical conductivity and thermodynamic properties of a hole-doped Mott insulator. Two well-separated temperature scales are identified: TFL below which Landau Fermi liquid behavior applies, and TMIR above which the resistivity exceeds the Mott-Ioffe-Regel value and bad-metal behavior is found. We show that quasiparticle excitations remain well defined above TFL and dominate transport throughout the intermediate regime TFLTTMIR. The lifetime of these resilient quasiparticles is longer for electronlike excitations and this pronounced particle-hole asymmetry has important consequences for the thermopower. The crossover into the bad-metal regime corresponds to the disappearance of these excitations and has clear signatures in optical spectroscopy.

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  • Received 4 October 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.086401

© 2013 American Physical Society

Authors & Affiliations

Xiaoyu Deng1,2,3, Jernej Mravlje4,1,5, Rok Žitko5, Michel Ferrero1, Gabriel Kotliar3, and Antoine Georges4,1,6,2

  • 1Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
  • 2Japan Science and Technology Agency, CREST, Kawaguchi 332-0012, Japan
  • 3Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA
  • 4Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France
  • 5Jožef Stefan Institute, Jamova 39, Ljubljana, Slovenia
  • 6DPMC, Université de Genève, 24 quai Ernest Ansermet, CH-1211 Genève, Suisse

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Issue

Vol. 110, Iss. 8 — 22 February 2013

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