Exchange-Driven Intermixing of Bulk and Topological Surface States by Chiral Excitons in Bi2Se3

Hou, Bowen; Wang, Dan; Barker, Bradford A.; Qiu, Diana Y.

doi:10.1103/physrevlett.130.216402

Exchange-Driven Intermixing of Bulk and Topological Surface States by Chiral Excitons in Bi 2 Se 3

Journal Article · Fri May 26 00:00:00 EDT 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.130.216402· OSTI ID:1991810

Hou, Bowen ^[1]; Wang, Dan ^[2]; ^[3]; ^[2]

Yale Univ., New Haven, CT (United States); Yale University
Yale Univ., New Haven, CT (United States)
Univ. of California, Merced, CA (United States)

Topological surface states (TSS) in the prototypical topological insulator (TI) Bi₂Se₃ 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 Bi₂Se₃. We identify multiple series of chiral excitons that exhibit both bulk and TSS character, due to exchange-driven mixing. Further, 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.

View Accepted Manuscript (DOE)

Research Organization:: Yale Univ., New Haven, CT (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); David and Lucile Packard Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)

Grant/Contract Number:: SC0021965; AC02-05CH11231

OSTI ID:: 1991810

Alternate ID(s):: OSTI ID: 1975406

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 130; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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