Magnetoexcitons and optical absorption of bilayer-structured topological insulators

Details Magnetoexcitons and optical absorption of bilayer-structured topological insulators Magnetoexcitons and optical absorption of bilayer-structured topological insulators

2012-01-12

arxiv.org/abs/1201.2505v2

Appl. Phys. Lett. 100, 161602 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 APL pages, 5 figures

Scientific paper

10.1063/1.4704657

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 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. Our results could be detected in the magneto-optical experiments.

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