Cusped Electrical Conductivity in Spin-1 Chiral Fermion Systems Arising from Multifold Band Degeneracy

TL;DR

This paper investigates how multifold band degeneracies in spin-1 chiral fermion systems influence electrical conductivity, revealing a cusp-like feature affected by disorder and band curvature, which enhances understanding of transport in topological semimetals.

Contribution

It introduces a theoretical analysis of disorder effects on conductivity in spin-1 chiral fermion systems with multifold band crossings, highlighting a novel cusp feature.

Findings

Cusp-like feature in conductivity appears away from band-crossing point

Cusp position and value depend on impurity scattering strength

Disorder and band curvature critically influence transport properties

Abstract

The energy-dependent electrical conductivity in spin-1 chiral fermion systems with disorder is studied using the self-consistent Born approximation. A distinct cusp-like feature appears at an energy different from the band-crossing point, arising from the multifold band-crossing structure formed by the Dirac and trivial bands. The energy position of the cusp and the corresponding value of the electrical conductivity are found to depend sensitively on both the impurity scattering strength and the curvature of the trivial band. These findings demonstrate the critical role of multifold band crossings and disorder-induced broadening of energy levels in determining the transport properties, offering theoretical insight into the unconventional conductivity behavior observed in topological semimetals hosting spin-1 chiral fermions.