title: Hidden Fermi liquid, scattering rate saturation, and Nernst effect: a dynamical mean-field theory perspective.
abstract: We investigate the transport properties of a correlated metal within dynamical mean-field theory. Canonical Fermi liquid behavior emerges only below a very low temperature scale T(FL). Surprisingly the quasiparticle scattering rate follows a quadratic temperature dependence up to much higher temperatures and crosses over to saturated behavior around a temperature scale T(sat). We identify these quasiparticles as constituents of the hidden Fermi liquid. The non-Fermi-liquid transport above T(FL), in particular the linear-in-T resistivity, is shown to be a result of a strongly temperature dependent band dispersion. We derive simple expressions for the resistivity, Hall angle, thermoelectric power and Nernst coefficient in terms of a temperature dependent renormalized band structure and the quasiparticle scattering rate. We discuss possible tests of the dynamical mean-field theory picture of transport using ac measurements.
authors.affiliation: Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, New Jersey 08854, USA.
authors.forename: Wenhu
authors.initials: W
authors.lastname: Xu
authors.forename: Kristjan
authors.initials: K
authors.lastname: Haule
authors.forename: Gabriel
authors.initials: G
authors.lastname: Kotliar