Nonlocal transport phenomena in Weyl metals beyond the mesoscopic scale

TL;DR

This paper predicts macroscopic nonlocal transport phenomena in Weyl metals caused by axion electrodynamics, specifically from negative longitudinal magneto-resistivity and anomalous Hall effect, beyond mesoscopic scales.

Contribution

It provides the first theoretical demonstration of nonlocal transport phenomena in bulk Weyl metals arising from axion electrodynamics beyond mesoscopic scales.

Findings

Nonlocal transport phenomena are linked to negative longitudinal magneto-resistivity and anomalous Hall effect.

These phenomena occur beyond the mesoscopic scale, independent of Fermi arcs.

The results support axion electrodynamics as a bulk property in Weyl metals.

Abstract

Axion electrodynamics governs electromagnetic properties of Weyl metals. Although transmission and reflection measurements of light have been proposed to confirm the axion electrodynamics, there are still lack of theoretical proposals for macroscopic nonlocal transport phenomena in Weyl metals. In this paper, we present nonlocal transport phenomena in time reversal symmetry-broken (TRSB) Weyl metals. Solving the axion electrodynamics numerically, we show that such nonlocal transport phenomena arise from the negative longitudinal magneto-resistivity (NLMR), combined with the anomalous Hall effect (AHE) in the axion electrodynamics. Since this nonlocal transport occurs beyond the mesoscopic scale, we conclude that these nonlocal properties have nothing to do with Fermi arcs, regarded to be clear evidence of the axion electrodynamics in the bulk.