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Chin. Phys. B, 2022, Vol. 31(6): 066802    DOI: 10.1088/1674-1056/ac632e

Surface electron doping induced double gap opening in Td-WTe2

Qi-Yuan Li(李启远)1,2, Yang-Yang Lv(吕洋洋)1,3, Yong-Jie Xu(徐永杰)1,2, Li Zhu(朱立)1,2, Wei-Min Zhao(赵伟民)1,2, Yanbin Chen(陈延彬)1,2,4, and Shao-Chun Li(李绍春)1,2,4,5,†
1 National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;
2 School of Physics, Nanjing University, Nanjing 210093, China;
3 Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;
4 Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;
5 Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, China
Abstract  By using scanning tunneling microscopy, we investigated the electronic evolution of Td-WTe2 via in-situ surface alkali K atoms deposition. The Td-WTe2 surface is electron doped upon K deposition, and as the K coverage increases, two gaps are sequentially opened near Fermi energy, which probably indicates that two phase transitions concomitantly occur during electron doping. The two gaps both show a dome-like dependence on the K coverage. While the bigger gap shows no prominent dependence on the magnetic field, the smaller one can be well suppressed and thus possibly corresponds to the superconducting transition. This work indicates that Td-WTe2 exhibits rich quantum states closely related to the carrier concentration.
Keywords:  scanning tunneling microscopy      Td-WTe2      surface electron doping      superconductivity transition  
Received:  18 January 2022      Revised:  20 March 2022      Accepted manuscript online:  01 April 2022
PACS:  68.37.Ef (Scanning tunneling microscopy (including chemistry induced with STM))  
  74.78.-w (Superconducting films and low-dimensional structures)  
  68.65.-k (Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)  
Fund: We thank Dr. Ping Zhang and Dr. Fawei Zheng for fruitful discussions. This work was financially supported by the National Natural Science Foundation of China (Grants Nos. 11790311, 92165205, 51902152, 11874210, and 11774149) and the National Key R&D Program of China (Grants No. 2021YFA1400403).
Corresponding Authors:  Shao-Chun Li     E-mail:

Cite this article: 

Qi-Yuan Li(李启远), Yang-Yang Lv(吕洋洋), Yong-Jie Xu(徐永杰), Li Zhu(朱立), Wei-Min Zhao(赵伟民), Yanbin Chen(陈延彬), and Shao-Chun Li(李绍春) Surface electron doping induced double gap opening in Td-WTe2 2022 Chin. Phys. B 31 066802

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