Quantization of the band at the surface of charge density wave material 2H-TaSe2

Li, Man; Xu, Nan; Zhang, Jianfeng; Lou, Rui; Shi, Ming; Li, Lijun; Lei, Hechang; Petrovic, Cedomir; Liu, Zhonghao; Liu, Kai; Huang, Yaobo; Wang, Shancai

doi:10.1088/1674-1056/abe9a8

Title: Quantization of the band at the surface of charge density wave material 2H-TaSe₂

Journal Article · Thu Apr 01 00:00:00 EDT 2021 · Chinese Physics B

DOI:https://doi.org/10.1088/1674-1056/abe9a8· OSTI ID:1827163

Li, Man ^[1]; Xu, Nan ^[2]; Zhang, Jianfeng ^[3]; Lou, Rui ^[3]; Shi, Ming ^[4]; Li, Lijun ^[5]; Lei, Hechang ^[3];

^[6]; Liu, Zhonghao ^[7]; Liu, Kai ^[3]; Huang, Yaobo ^[7]; Wang, Shancai ^[3]

Renmin University of China, Beijing (China); Chinese Academy of Sciences, Shanghai (China)
Wuhan University (China)
Renmin University of China, Beijing (China)
Paul Scherrer Institute (PSI), Villigen (Switzerland)
Chongqing Technology and Busineee University (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Chinese Academy of Sciences, Shanghai (China)

By using angle-resolved photoemission spectroscopy combined with the first-principles electronics atructure calculations, we report the quantum well states at the surface of a single crystal 2H-TaSe₂. We observed sub-bands at the three-dimensional Brillouin zone center forming the quantized states due to its highly dispersive nature and light effective mass along k_z direction. The quantized sub-bands shift upward towards E_F with the decrease of temperature across TCDW. The band shift could not be explained by two-dimensional Fermi-surface nesting-driven charge density waves(CDW), nor by purely strong electron-phonon coupling only. The CDW in 2H-TaSe₂ is likely related to the bands at higher binding energy, and the CDW mechanism could be explained by the excitons, and our observation gives support to this scenario.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC0012704

OSTI ID:: 1827163

Report Number(s):: BNL-222280-2021-JAAM; TRN: US2215941

Journal Information:: Chinese Physics B, Vol. 30, Issue 4; ISSN 1674-1056

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Quantization of the band at the surface of charge density wave material 2H-TaSe2

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Title: Quantization of the band at the surface of charge density wave material 2H-TaSe₂