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Quantization of the band at the surface of charge density wave material 2H-TaSe2 |
| Man Li(李满)1,2,†, Nan Xu(徐楠)3,†, Jianfeng Zhang(张建丰)1,†, Rui Lou(娄睿)1, Ming Shi(史明)4, Lijun Li(黎丽君)5, Hechang Lei(雷和畅)1, Cedomir Petrovic6, Zhonghao Liu(刘中灏)7, Kai Liu(刘凯)1, Yaobo Huang(黄耀波)2,‡, and Shancai Wang(王善才)1,§ |
1 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;
3 Institute of Advanced Studies, Wuhan University, Wuhan 430072, China;
4 Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland;
5 Chongqing Technology and Busineee University, Chongqing 400067, China;
6 Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA;
7 State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics, SIMIT, Chinese Academy of Sciences, Shanghai 200050, China |
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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 kz direction. The quantized sub-bands shift upward towards EF while the bulk band at $\varGamma$ 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.
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Received: 13 January 2021
Revised: 08 February 2021
Accepted manuscript online: 25 February 2021
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PACS:
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73.20.-r
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(Electron states at surfaces and interfaces)
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79.60.-i
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(Photoemission and photoelectron spectra)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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| 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). |
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Corresponding Authors:
†These authors contributed equally. ‡Corresponding author. E-mail: huangyaobo@zjlab.org.cn §Corresponding author. E-mail: scw@ruc.edu.cn
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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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