Abstract
Exciton edge states and the microwave edge exciton absorption of a 2D topological insulator subject to the in-plane magnetic field are studied. The magnetic field forms a narrow gap in electron edge states that allows the existence of edge exciton. The exciton binding energy is found to be much smaller than the energy of a 1D Coulomb state. Phototransitions exist on the exciton states with even numbers, while odd exciton states are dark.
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Entin, M.V., Magarill, L.I. & Mahmoodian, M.M. Edge excitons in a 2D topological insulator in a magnetic field. Jetp Lett. 103, 328–333 (2016). https://doi.org/10.1134/S0021364016050039
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DOI: https://doi.org/10.1134/S0021364016050039