2012/10/31 by Xiaoyu Deng, Jernej Mravlje, Rok Zitko +3 · 1 citation
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.110.086401
published as Phys. Rev. Lett. 110, 086401 (2013) · 5 pages + 4 supplementary pages; published version
arxiv created 2013/02/22 · arxiv updated 2013/02/25
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 TFL < TMIR. The lifetime of these `resilient quasiparticles' is longer for electron-like 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.