2012/01/31 by Zhigang Wang, Zhen-Guo Fu, Ping Zhang
Materials Science · Physics and Astronomy · #Absorption (acoustics) #Absorption spectroscopy #Chemical and Physical Properties of Materials #Coulomb #Magnetic field #Quantum and electron transport phenomena #Spectroscopy #Topological Materials and Phenomena #Topological insulator #X-ray absorption spectroscopy #cond-mat.mes-hall
paper · pdf · doi:10.1063/1.4704657
published as Appl. Phys. Lett. 100, 161602 (2012) · 4 APL pages, 5 figures
openalex publication_date 2012/04/16 · arxiv created 2012/04/18 · arxiv updated 2012/04/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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.