Imaginary part of Hall conductivity in tilted doped Weyl semimetal with both broken time reversal and inversion symmetry

TL;DR

This paper investigates the imaginary part of the Hall conductivity in tilted, doped Weyl semimetals with broken symmetries, revealing how photon energy influences absorption related to chirality and tilt.

Contribution

It provides a detailed analysis of the absorptive Hall conductivity in tilted Weyl semimetals with broken symmetries, highlighting the dependence on photon energy and chirality.

Findings

Sign change in Hall conductivity with chirality or tilt reversal.

Photon energy ranges where only one chirality contributes to absorption.

Regions where absorption is absent or constant for type I and type II Weyl semimetals.

Abstract

We consider a Weyl semimetal (WSM) with finite doping and tilt within a continuum model Hamiltonian with both broken time reversal and inversion symmetry. We calculate the absorptive part of the anomalous AC Hall conductivity as a function of photon energy ($\Omega$) for both type I and type II Weyl semimetal. For a given Weyl node, changing the sign of its chirality or of its tilt changes the sign of its contribution to the absorptive Hall conductivity with no change in magnitude. For a noncentrosymmetric system we find that there are ranges of photon energies for which only the positive or only the negative chirality node contributes to the imaginary (absorptive) part of the Hall conductivity. There are also other photon energies where both chirality contribute and there can be other ranges of $\Omega$ where there is no absorption associated with the AC Hall conductivity in type I and regions where it is instead constant for type II. We comment on implications for the absorption of circular polarized light.