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

doi:10.1088/1674-1056/abe9a8

Abstract By using angle-resolved photoemission spectroscopy (ARPES) combined with the first-principles electronic structure calculations, we report the quantized states at the surface of a single crystal 2H-TaSe₂. We have observed sub-bands of quantized states at the three-dimensional Brillouin zone center due to a highly dispersive band with light effective mass along k_z direction. The quantized sub-bands shift upward towards E_F while the bulk band at

Γ

shifts downward with the decrease of temperature across charge density wave (CDW) formation. The band shifts could be intimately related to the CDW. While neither the two-dimensional Fermi-surface nesting nor purely strong electron-phonon coupling can explain the mechanism of CDW in 2H-TaSe₂, our experiment may ignite the interest in understanding the CDW mechanism in this family.

Keywords: angle-resolved photoemission spectroscopy transition metal dichalcogenide TaSe₂

Received: 13 January 2021
Revised: 08 February 2021
Accepted manuscript online: 25 February 2021

PACS:	73.20.-r	(Electron states at surfaces and interfaces)
	79.60.-i	(Photoemission and photoelectron spectra)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11774421, 11774424, 11574394, 11774423, 11822412, and 11874047), the National Key R&D Program of China (Grant Nos. 2016YFA0401002, 2018YFA0307000, 2016YFA0300504, and 2018FYA0305800), and the Fundamental Research Funds for the Central Universities, China (Grant No. 2042018kf-0030).

Corresponding Authors: ^†These authors contributed equally. ^‡Corresponding author. E-mail: huangyaobo@zjlab.org.cn ^§Corresponding author. E-mail: scw@ruc.edu.cn

Cite this article:

Man Li(李满), Nan Xu(徐楠), Jianfeng Zhang(张建丰), Rui Lou(娄睿), Ming Shi(史明), Lijun Li(黎丽君), Hechang Lei(雷和畅), Cedomir Petrovic, Zhonghao Liu(刘中灏), Kai Liu(刘凯), Yaobo Huang(黄耀波), and Shancai Wang(王善才) Quantization of the band at the surface of charge density wave material 2H-TaSe₂ 2021 Chin. Phys. B 30 047305

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