Landau levels and magnetic oscillations in gapped Dirac materials with intrinsic Rashba interaction

TL;DR

This paper investigates how intrinsic Rashba spin-orbit interaction affects Landau levels and magnetic oscillations in gapped Dirac materials like silicene and germanene, revealing tunable features useful for experimental analysis.

Contribution

It provides analytical and numerical analysis of Rashba interaction effects on Landau levels and magnetic oscillations in low-buckled Dirac materials, highlighting tunable oscillation features.

Findings

Rashba interaction modifies Landau level energies.

Magnetic oscillations exhibit beats influenced by electric field.

Beat frequency depends on carrier concentration and Rashba strength.

Abstract

A new family of the low-buckled Dirac materials which includes silicene, germanene, etc. is expected to possess a more complicated sequence of Landau levels than in pristine graphene. Their energies depend, among other factors, on the strength of the intrinsic spin-orbit (SO) and Rashba SO couplings and can be tuned by an applied electric field $E_z$. We studied the influence of the intrinsic Rashba SO term on the energies of Landau levels using both analytical and numerical methods. The quantum magnetic oscillations of the density of states are also investigated. A specific feature of the oscillations is the presence of the beats with the frequency proportional to the field $E_z$. The frequency of the beats becomes also dependent on the carrier concentration when Rashba interaction is present allowing experimental determination of its strength.