Magneto-optics of general pseudospin-s two-dimensional Dirac-Weyl fermions

TL;DR

This paper calculates the magneto-optical conductivity of two-dimensional Dirac-Weyl systems with arbitrary pseudospin s, revealing unique spectral signatures for different s values and advancing understanding of their optical responses in magnetic fields.

Contribution

It generalizes magneto-optical conductivity calculations to pseudospin-s Dirac-Weyl systems for various s, extending previous work limited to s=1/2.

Findings

Distinct spectral patterns for different pseudospin values

Landau levels form from 2s+1 energy bands in magnetic fields

Unique optical signatures emerge as chemical potential varies

Abstract

The popularity of graphene--a pseudospin-1/2 two-dimensional Dirac-Weyl material--has prompted the search for related materials and the characterization of their properties. In this work, the magneto-optical conductivity is calculated for systems that obey the general pseudospin-s two-dimensional Dirac-Weyl Hamiltonian, with particular focus on s = {1/2, 1, 3/2, 2}. This generalizes calculations that have been made for s = 1/2 and follows previous work on the optical response of these systems in zero field. In the presence of a magnetic field, Landau levels condense out of the 2s+1 energy bands. As the chemical potential in a system is shifted, patterns arise in the appearance and disappearance of certain peaks within the optical spectra. These patterns are markedly different for each case considered, creating unique signatures in the magneto-optics. The general structure of each spectrum and how they compare is discussed.