Exchange-Driven Intermixing of Bulk and Topological Surface States by Chiral Excitons inBi2Se3,Physical Review Letters

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Exchange-Driven Intermixing of Bulk and Topological Surface States by Chiral Excitons inBi2Se3
Physical Review Letters ( IF 8.1 ) Pub Date : 2023-05-26 , DOI: 10.1103/physrevlett.130.216402
Bowen Hou ₁ , Dan Wang ₁ , Bradford A Barker ₂ , Diana Y Qiu ₁

Affiliation

Topological surface states (TSS) in the prototypical topological insulator (TI)

{Bi}_{2} {Se}_{3}

are frequently characterized using optical probes, but electron-hole interactions and their effect on surface localization and optical response of the TSS remain unexplored. Here, we use ab initio calculations to understand excitonic effects in the bulk and surface of

{Bi}_{2} {Se}_{3}

. We identify multiple series of chiral excitons that exhibit both bulk and TSS character, due to exchange-driven mixing. Our results address fundamental questions about the degree to which electron-hole interactions can relax the topological protection of surface states and dipole selection rules for circularly polarized light in TIs by elucidating the complex intermixture of bulk and surface states excited in optical measurements and their coupling to light.

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