Optical refraction and absorption spectra in perturbed monolayer PbBiI

Author:

Phong Tran C.1ORCID,Phuong Le T. T.12ORCID

Affiliation:

1. Center for Theoretical and Computational Physics, University of Education, Hue University, Hue 530000, Vietnam

2. Department of Physics, University of Education, Hue University, Hue 530000, Vietnam

Abstract

We investigate the optical properties of a noncentrosymmetric quantum spin Hall insulator in the presence of electric and magnetic fields. We employ the Kubo formula to engineer the optical redshift and blueshift phenomena through the interplay between the bulk gap, the Rashba-like gap, and the external fields. Intriguingly, for a range of electric (magnetic) fields, the refracted and absorbed lights exhibit direct (indirect) interband optical transitions. Accordingly, for a critical electric field, optical refraction and absorption spectrum decreases gradually and becomes constant, respectively. While for a critical magnetic field, step-like jumps appear in the optical coefficients. All these findings are discussed in the context of symmetry breaking.

Funder

National Foundation for Science and Technology Development

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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