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Phase changings in the surface layers of Td-WTe2 driven by alkali-metal deposition |
| Yu Zhu(朱玉)1, Zheng-Guo Wang(王政国)1, Yu-Jing Ren(任宇靖)1, Peng-Hao Yuan(袁鹏浩)1, Jing-Zhi Chen(陈景芝)1, Yi Ou(欧仪)1, Li-Li Meng(孟丽丽)1, and Yan Zhang(张焱)1,2† |
1 International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China;
2 Collaborative Innovation Center of Quantum Matter, Beijing 100871, China |
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Abstract The discovery of phase changings in two-dimensional (2D) materials driven by external stimuli not only helps to understand the various intriguing phases in 2D materials but also provides directions for constructing new functional devices. Here, by combining angle-resolved photoemission spectroscopy (ARPES) and \textit{in-situ} alkali-metal deposition, we studied how alkali-metal adatoms affect the electronic structure of T$_{\rm d}$-WTe$_{2}$ on two different cleaved surfaces. We found that depending on the polarization direction of the cleaved surface, the alkali-metal deposition triggered two successive phase transitions on one surface of WTe$_{2}$, while on the other surface, no phase transition was found. We attributed the observed phase transitions to a T$_{\rm d\uparrow }$-1T$'$-T$_{\rm d\downarrow }$ structural transition driven by an alkali-metal induced sliding of WTe$_{2}$ layers. By comparing the band structure obtained in different structural phases of WTe$_{2}$, we found that the evolution of band structure across different phases is characterized by an energy scale that could be related to the degree of orbital hybridization between two adjacent WTe$_{2}$ layers. Our results demonstrate a method that manipulates the surface structure of bulk 2D materials. It also builds a direct correlation between the electronic structure and the degree of interlayer misalignment in this intriguing 2D material.
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Received: 23 November 2024
Revised: 07 December 2024
Accepted manuscript online: 13 December 2024
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PACS:
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73.20.At
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(Surface states, band structure, electron density of states)
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77.22.Ej
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(Polarization and depolarization)
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79.60.-i
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(Photoemission and photoelectron spectra)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1403502) and the National Natural Science Foundation of China (Grant No. 11888101). |
Corresponding Authors:
Yan Zhang
E-mail: yzhang85@pku.edu.cn
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| About author: 2025-017302-241694.pdf |
Cite this article:
Yu Zhu(朱玉), Zheng-Guo Wang(王政国), Yu-Jing Ren(任宇靖), Peng-Hao Yuan(袁鹏浩), Jing-Zhi Chen(陈景芝), Yi Ou(欧仪), Li-Li Meng(孟丽丽), and Yan Zhang(张焱) Phase changings in the surface layers of Td-WTe2 driven by alkali-metal deposition 2025 Chin. Phys. B 34 017302
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