Equivalence of single-particle and transport lifetimes from hybridization fluctuations

Abstract

Single band theories of quantum criticality successfully describe a single-particle lifetime with non-Fermi liquid temperature dependence. But, they fail to obtain a charge transport rate with the same dependence unless the interaction is assumed to be momentum independent. Here we demonstrate that a quantum critical material, with a long range mode that transmutes electrons between light and heavy bands, exhibits a quasi-linear temperature dependence for {\it both} the single-particle and the charge transport lifetimes, despite the strong momentum dependence of the interaction.

4+ pages, 2 figures