Work

Magnetoexcitons and optical absorption of bilayer-structured topological insulators

Year: 2012

Type: article

Abstract: The optical absorption properties of magnetoexcitons in topological insulator bilayers under a strong magnetic field are theoretically studied. A general analytical formula of optical absorption selection rule is obtained in the noninteracting as well as Coulomb intra-Landau-level (LL) interacting cases, which remarkably helps to interpret the resonant peaks in absorption spectroscopy and the corresponding formation of Dirac-type magnetoexcitons. We also discuss the optical absorption spectroscopy of magnetoexcitons in the presence of inter-Landau-level Coulomb interaction, which becomes more complex. We hope our results can be detected in the future magneto-optical experiments.

Source: Applied Physics Letters

DOI: 10.1063/1.4704657

Authors: Zhigang Wang, Zhen-Guo Fu, Ping Zhang

Institutions: Institute of Applied Physics and Computational Mathematics, Chinese Academy of Sciences, Institute of Semiconductors

Language: English

Topic: Topological Materials and Phenomena

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: National Natural Science Foundation of China

Award: 自旋手性材料中的贝里位相效应和反常量子输运研究