Excitons and Optical Absorption on the Surface of a Strong Topological Insulator with a Magnetic Energy Gap

Abstract

We present a theoretical study of interacting electron-hole pairs located on a magnetized surface of a strong topological insulator (TI). The excitonic energy levels and the optical absorption on such surface display unique and potentially measurable features such as (i) an enhanced binding energy for excitons whose total angular momentum is aligned with the magnetic exchange field, (ii) a stark dependence of the optical absorption on the direction of the magnetic exchange field as well as on the chirality of the incident light, and (iii) a tunable center-of-mass motion of spinful excitons induced by particle-hole asymmetry in the exchange field. Our predictions are relevant to surfaces of magnetically doped TIs or surfaces coated with magnetic films, in addition to TI nanowires placed under longitudinal magnetic fields.

arXiv comment12 pages and 9 figures. Revised version, accepted in Phys. Rev. B

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• Model Prediction of Self-Rotating Excitons in Two-Dimensional Transition-Metal Dichalcogenides
• Magneto-optical transport properties of monolayer WSe2
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• Floquet topological phase of nondriven $p$-wave nonequilibrium excitonic insulators
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• Charged exctions in two-dimensional transition-metal dichalcogenides - semiclassical calculation of Berry-curvature effects
• Polariton Hall Effect in Transition-Metal Dichalcogenides
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• Two-body problem for two-dimensional electrons in Bernervig-Hughes-Zhang model
• Quantum Geometric Exciton Drift Velocity
• Resonant Faraday and Kerr effects due to in-gap states on the surface of a topological insulator
• Exchange-Driven Intermixing of Bulk and Topological Surface State by Chiral Excitons in Bi2Se3
• Fingerprints of Berry phases in the bulk exciton spectrum of a topological insulator
• Exciton absorption spectra in narrow armchair graphene nanoribbons in electric fields
• Excitonic effects in time-dependent density functional theory from zeros of the density response
• Optical absorption in interacting and nonlinear Weyl semimetals
• Quantum Internal Structure of Plasmons
• Sommerfeld enhancement factor in two-dimensional Dirac materials
• Hybrid dark excitons in monolayer ${MoS}_2$
• Unconventional quantum Hall effect in Floquet topological insulators