Quantization of the band at the surface of charge density wave material 2H-TaSe2
- 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 kz direction. The quantized sub-bands shift upward towards EF 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.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1827163
- Alternate ID(s):
- OSTI ID: 23162489
- Report Number(s):
- BNL--222280-2021-JAAM
- Journal Information:
- Chinese Physics B, Journal Name: Chinese Physics B Journal Issue: 4 Vol. 30; ISSN 1674-1056
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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