Disorder induced dynamical interband response in Dirac nodal line semimetals

TL;DR

This paper investigates how disorder affects the dynamical interband response in Dirac nodal line semimetals, revealing that disorder-induced effects dominate the total response and produce a resonance peak at twice the chemical potential.

Contribution

It introduces a quantum kinetic approach to analyze disorder effects on dynamical interband response in Dirac nodal line semimetals, highlighting the dominance of extrinsic disorder contributions.

Findings

Resonance peak at twice the chemical potential due to disorder

Intrinsic response peak depends on mass and chemical potential

Disorder effects mainly dominate the total interband response

Abstract

To obtain the total response of the system, the effect of disorder cannot be neglected, as it introduces a new contribution (i.e. extrinsic) in the total response of the system. In the study of dynamical (AC) effects, the interband response exhibits an exotic resonance peak due to interband transitions. Here, the dynamical interband response of Dirac nodal line semimetal is investigated by using the quantum kinetic approach. The scattering driven effect is analyzed under the first-order Born approximation (i.e., in the weak disorder limit) and reveals a resonance peak at $2\tilde{\mu}$. In contrast, the field driven intrinsic response peak depends on both the mass ($\tilde{M}$) and chemical potential ($\tilde{\mu}$). The results indicate that the total interband response of the 3D nodal line semimetals, is mainly dominated by the disorder induced contributions.