Anisotropic surface state in a topological semimetal candidate Ta3SiTe6

Li, Yunlong; Ran, Zhao; Jiang, Wenxiang; Jing, Qiang; Hu, Jiayuan; Luo, Weidong; Qian, Dong

doi:10.1063/5.0073344

Title: Anisotropic surface state in a topological semimetal candidate Ta₃SiTe₆

Journal Article · 24 January 2022 · Applied Physics Letters

DOI: https://doi.org/10.1063/5.0073344 · OSTI ID:1982366

^[1]; Ran, Zhao ^[1]; Jiang, Wenxiang ^[1]; Jing, Qiang ^[1]; Hu, Jiayuan ^[1];

^[1];

^[2]

Shanghai Jiao Tong Univ. (China). Shenyang National Laboratory for Materials Science, School of Physics and Astronomy
Shanghai Jiao Tong Univ. (China). Tsung-Dao Lee Institute; Shanghai Jiao Tong Univ. (China). Shenyang National Laboratory for Materials Science, School of Physics and Astronomy

Using high-resolution angle-resolved photoemission spectroscopy, we studied the surface state of Ta₃SiTe₆, a candidate of topological semimetal protected by nonsymmorphic symmetry. Through photon-energy dependent measurements, the surface state near the Fermi level was detected. By determining the band dispersions, we found that the surface state is topological trivial. Around the surface Brillouin zone center, the surface bands disperse linear-like, forming a band crossing (zero energy gap) point at about 0.2 eV below the Fermi level. In Ta₃SiTe₆'s rectangular surface Brillouin zone, the surface bands only cross the Fermi level along one axis, forming two hole-like Fermi pockets near surface Brillouin zone boundaries. Although the observed surface state is not topological, we proposed that its anisotropic Fermi surface topography could be potentially useful for future applications.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1982366

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 120; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Anisotropic surface state in a topological semimetal candidate Ta₃SiTe₆