| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Charge Density Wave and Electron-Phonon Interaction in Epitaxial Monolayer NbSe$_{2}$ Films |
| Xuedong Xie1, Dongjing Lin1, Li Zhu1, Qiyuan Li1, Junyu Zong1, Wang Chen1, Qinghao Meng1, Qichao Tian1, Shao-Chun Li1,2, Xiaoxiang Xi1,2, Can Wang1,2*, and Yi Zhang1,2* |
1National Laboratory of Solid State Microstructure, School of Physics, Nanjing University, Nanjing 210093, China
2Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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| Cite this article: |
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Xuedong Xie, Dongjing Lin, Li Zhu et al 2021 Chin. Phys. Lett. 38 107101 |
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Abstract Understanding the interplay between superconductivity and charge-density wave (CDW) in NbSe$_{2}$ is vital for both fundamental physics and future device applications. Here, combining scanning tunneling microscopy, angle-resolved photoemission spectroscopy and Raman spectroscopy, we study the CDW phase in the monolayer NbSe$_{2}$ films grown on various substrates of bilayer graphene (BLG), SrTiO$_{3}$(111), and Al$_{2}$O$_{3}$(0001). It is found that the two stable CDW states of monolayer NbSe$_{2}$ can coexist on NbSe$_{2}$/BLG surface at liquid-nitrogen temperature. For the NbSe$_{2}$/SrTiO$_{3}$(111) sample, the unidirectional CDW regions own the kinks at $\pm 41$ meV and a wider gap at 4.2 K. It is revealed that the charge transfer from the substrates to the grown films will influence the configurations of the Fermi surface, and induce a 130 meV lift-up of the Fermi level with a shrink of the Fermi pockets in NbSe$_{2}$/SrTiO$_{3}$(111) compared with the NbSe$_{2}$/BLG. Combining the temperature-dependent Raman experiments, we suggest that the electron-phonon coupling in monolayer NbSe$_{2}$ dominates its CDW phase transition.
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Received: 25 June 2021
Editors Suggestion
Published: 28 September 2021
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| PACS: |
71.45.Lr
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(Charge-density-wave systems)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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79.60.-i
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(Photoemission and photoelectron spectra)
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68.37.Ef
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(Scanning tunneling microscopy (including chemistry induced with STM))
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11774154, 11790311, and 12004172), the National Key Research and Development Program of China (Grant No. 2018YFA0306800), the Fundamental Research Funds for the Central Universities (Grant No. 0204-14380186), the Jiangsu Planned Projects for Postdoctoral Research Funds (Grant No. 2020Z172), the Program for High-Level Entrepreneurial and Innovative Talents Introduction of Jiangsu Province, and the Program B for Outstanding Ph.D. Candidates of Nanjing University. |
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