Programme

P.27 -- Poster, VCTP-47

Date: Tuesday, 2 August 2022

Time: 08:30 - 10:00

Optical refraction and absorption spectra in perturbed monolayer PbBiI

Le Thi Thu Phuong (1), Tran Cong Phong (1)

(1) Department of Physics, University of Education, Hue University

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.

Presenter: Le Thi Thu Phuong