title: Hydrodynamic theory of thermoelectric transport and negative magnetoresistance in Weyl semimetals.
abstract: We present a theory of thermoelectric transport in weakly disordered Weyl semimetals where the electron-electron scattering time is faster than the electron-impurity scattering time. Our hydrodynamic theory consists of relativistic fluids at each Weyl node, coupled together by perturbatively small intervalley scattering, and long-range Coulomb interactions. The conductivity matrix of our theory is Onsager reciprocal and positive semidefinite. In addition to the usual axial anomaly, we account for the effects of a distinct, axial-gravitational anomaly expected to be present in Weyl semimetals. Negative thermal magnetoresistance is a sharp, experimentally accessible signature of this axial-gravitational anomaly, even beyond the hydrodynamic limit.
authors: Department of Physics, Harvard University, Cambridge, MA 02138; sachdev@g.harvard.edu lucas@fas.harvard.edu rdavison@physics.harvard.edu.
authors: Andrew
authors: A
authors: Lucas
authors: Department of Physics, Harvard University, Cambridge, MA 02138; sachdev@g.harvard.edu lucas@fas.harvard.edu rdavison@physics.harvard.edu.
authors: Richard A
authors: RA
authors: Davison
authors: Department of Physics, Harvard University, Cambridge, MA 02138; Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada sachdev@g.harvard.edu lucas@fas.harvard.edu rdavison@physics.harvard.edu.
authors: Subir
authors: 0000-0002-2432-7070
authors: S
authors: Sachdev
keywords: Weyl metals; anomalies; hydrodynamics; thermoelectric effects