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. 2013 Feb 22;110(8):086401.
doi: 10.1103/PhysRevLett.110.086401. Epub 2013 Feb 19.

How bad metals turn good: spectroscopic signatures of resilient quasiparticles

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How bad metals turn good: spectroscopic signatures of resilient quasiparticles

Xiaoyu Deng et al. Phys Rev Lett. .

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: T(FL) below which Landau Fermi liquid behavior applies, and T(MIR) 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 T(FL) and dominate transport throughout the intermediate regime T(FL) </~ T </~ T(MIR). 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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