Theory of electron spin resonance in bulk topological insulators Bi2Se3, Bi2Te3 and Sb2Te3

TL;DR

This paper presents a theoretical analysis of electron spin resonance in bulk topological insulators Bi2Se3, Bi2Te3, and Sb2Te3, focusing on their energy spectra, response to electromagnetic fields, and effective g-factors.

Contribution

It introduces a detailed theoretical framework using a four-band model to analyze ESR phenomena in these materials, including selection rules and absorption spectra.

Findings

Determined electron energy spectra in magnetic fields.

Calculated absorption spectra and selection rules.

Extracted effective g-factors for electrons and holes.

Abstract

We report a theoretical study of electron spin resonance in bulk topological insulators, such as Bi2Se3, Bi2Te3 and Sb2Te3. Using the effective four-band model, we find the electron energy spectrum in a static magnetic field and determine the response to electric and magnetic dipole perturbations, represented by oscillating electric and magnetic fields perpendicular to the static field. We determine the associated selection rules and calculate the absorption spectra. This enables us to separate the effective orbital and spin degrees of freedom and to determine the effective g-factors for electrons and holes.