Untangling charge-order dependent bulk states from surface effects in a topological kagome metal ScV6Sn6

Cheng, Zi-Jia; Shao, Sen; Kim, Byunghoon; Cochran, Tyler A; Yang, Xian P; Yi, Changjiang; Jiang, Yu-Xiao; Zhang, Junyi; Hossain, Md Shafayat; Roychowdhury, Subhajit; Yilmaz, Turgut; Vescovo, Elio; Fedorov, Alexei; Shekhar, Chandra; Felser, Claudia; Chang, Guoqing; Hasan, M Zahid

doi:10.1103/physrevb.109.075150

Untangling charge-order dependent bulk states from surface effects in a topological kagome metal ScV₆Sn₆

Journal Article · Fri Feb 23 00:00:00 EST 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.109.075150· OSTI ID:2432501

Cheng, Zi-Jia ^[1]; Shao, Sen ^[2]; Kim, Byunghoon ^[1]; Cochran, Tyler A ^[1]; Yang, Xian P ^[1]; Yi, Changjiang ^[3]; Jiang, Yu-Xiao ^[1]; Zhang, Junyi ^[4]; Hossain, Md Shafayat ^[1]; Roychowdhury, Subhajit ^[3]; Yilmaz, Turgut ^[5]; Vescovo, Elio ^[5]; Fedorov, Alexei ^[6]; Shekhar, Chandra ^[3]; Felser, Claudia ^[3]; Chang, Guoqing ^[2]; Hasan, M Zahid ^[1]

Princeton Univ., NJ (United States)
Nanyang Technological Univ. (Singapore)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Johns Hopkins Univ., Baltimore, MD (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Kagome metals with charge density wave (CDW) order exhibit a broad spectrum of intriguing quantum phenomena. The recent discovery of the novel kagome CDW compound ScV₆Sn₆ has spurred significant interest. However, understanding the interplay between CDW and the bulk electronic structure has been obscured by a profusion of surface states and terminations in this quantum material. Here, in this study, we employ photoemission spectroscopy and potassium dosing to elucidate the complete bulk band structure of ScV₆Sn₆, revealing multiple van Hove singularities near the Fermi level. We surprisingly discover a robust spin-polarized topological Dirac surface resonance state at the M point within the twofold van Hove singularities. Assisted by first-principles calculations, the temperature dependence of the k_z-resolved angle-resolved photoemission spectroscopy spectrum provides unequivocal evidence for the proposed $$\sqrt{3}$$×$$\sqrt{3}$$×3 charge order over other candidates. Our work not only enhances the understanding of the CDW-dependent bulk and surface states in ScV₆Sn₆, but also establishes an essential foundation for potential manipulation of the CDW order in kagome materials.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation (GBMF); National Research Foundation of Singapore; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231; FG02-05ER46200; SC0012704

OSTI ID:: 2432501

Alternate ID(s):: OSTI ID: 2432581
OSTI ID: 2474238

Report Number(s):: BNL--225961-2024-JAAM; ark:/13030/qt2z7738h7

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 7 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Untangling charge-order dependent bulk states from surface effects in a topological kagome metal ScV6Sn6

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