Phonon-mediated Hydrodynamic Transport in a Weyl Semimetal

Abstract

We analyze from a microscopic point of view the feasibility of a hydrodynamic regime in a type-I Weyl semimetal driven by electron-electron interactions mediated by virtual phonons. Considering also the effects of of impurities and the absorption/emission of real phonons, the electric and thermal conductivities are derived. At temperatures $T$ above the Bloch-Grüneisen temperature $T_{\text{BG}}$, virtual phonons behave similarly to real phonons, but the Lorenz ratio is modified by a constant prefactor dependent on the Fermi surface geometry. For temperatures below $T_{\text{BG}}$, processes that do not conserve chirality induce a $T^2$ dependence in the electric resistivity, opening a window where momentum-conserving interactions dominate transport signatures. We quantitatively discuss this hydrodynamic window and put it into context with recent experimental literature on the subject.

arXiv comment11(Main text)+22(appendix) pages. 3 Figs. Supplementary Material already included as pdf in the source file

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