Surface collective modes in the topological insulators Bi2Se3 and Bi0.5Sb1.5Te3-xSex

Kogar, A.; Gu, G.; Vig, S.; Thaler, A.; Wong, M. H.; Xiao, Y.; Reig-i-Plessis, D.; Cho, G. Y.; Valla, T.; Pan, Z.; Schneeloch, J.; Zhong, R.; Hughes, T. L.; MacDougall, G. J.; Chiang, T. -C.; Abbamonte, P.

doi:10.1103/PhysRevLett.115.257402

Title: Surface collective modes in the topological insulators Bi₂Se₃ and Bi_0.5Sb_1.5Te_3-xSe_x

Journal Article · Tue Dec 15 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.115.257402· OSTI ID:1240702

Kogar, A. ^[1]; Gu, G. ^[2]; Vig, S. ^[1]; Thaler, A. ^[1]; Wong, M. H. ^[1]; Xiao, Y. ^[1]; Reig-i-Plessis, D. ^[1]; Cho, G. Y. ^[3]; Valla, T. ^[2]; Pan, Z. ^[2]; Schneeloch, J. ^[2]; Zhong, R. ^[2]; Hughes, T. L. ^[1]; MacDougall, G. J. ^[1]; Chiang, T. -C. ^[1]; Abbamonte, P. ^[1]

Univ. of Illinois, Urbana, IL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Korea Advanced Institute of Science and Technology, Daejeon (Korea)

In this study, we used low-energy, momentum-resolved inelastic electron scattering to study surface collective modes of the three-dimensional topological insulators Bi₂Se₃ and Bi_0.5Sb_1.5Te_3-xSe_x. Our goal was to identify the “spin plasmon” predicted by Raghu and co-workers [Phys. Rev. Lett. 104, 116401 (2010)]. Instead, we found that the primary collective mode is a surface plasmon arising from the bulk, free carriers in these materials. This excitation dominates the spectral weight in the bosonic function of the surface χ''(q,ω) at THz energy scales, and is the most likely origin of a quasiparticle dispersion kink observed in previous photoemission experiments. Our study suggests that the spin plasmon may mix with this other surface mode, calling for a more nuanced understanding of optical experiments in which the spin plasmon is reported to play a role.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; AC02-98CH10886; SC00112704; FG02-07ER46383; SC0012649

OSTI ID:: 1240702

Alternate ID(s):: OSTI ID: 1229910

Report Number(s):: BNL-111864-2016-JA; PRLTAO; R&D Project: PO010; PO016; KC0201060; KC0202020

Journal Information:: Physical Review Letters, Vol. 115, Issue 25; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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