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VOLUME 103 (2016) | ISSUE 5 | PAGE 372
Edge excitons in a 2D topological insulator in the magnetic field
DOI: 10.7868/S0370274X16050088
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.