| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Photodoping-Modified Charge Density Wave Phase Transition in WS$_{{2}}$/1T-TaS$_{2}$ Heterostructure |
| Rui Wang1,2†, Jianwei Ding2,4†, Fei Sun5, Jimin Zhao3,4,6*, and Xiaohui Qiu2,4* |
1Beijing Information Technology College, Beijing 100015, China
2CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4University of Chinese Academy of Sciences, Beijing 100049, China
5Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany
6Songshan Lake Materials Laboratory, Dongguan 523808, China
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| Cite this article: |
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Rui Wang, Jianwei Ding, Fei Sun et al 2024 Chin. Phys. Lett. 41 057801 |
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Abstract Controlling collective electronic states hold great promise for development of innovative devices. Here, we experimentally detect the modification of the charge density wave (CDW) phase transition within a 1T-TaS$_{{2}}$ layer in a WS$_{{2}}$/1T-TaS$_{{2}}$ heterostructure using time-resolved ultrafast spectroscopy. Laser-induced charge transfer doping strongly suppresses the commensurate CDW phase, which results in a significant decrease in both the phase transition temperature ($T_{\rm c}$) and phase transition stiffness. We interpret the phenomenon that photo-induced hole doping, when surpassing a critical threshold value of $\sim$ $10^{18}$ cm$^{-3}$, sharply decreases the phase transition energy barrier. Our results provide new insights into controlling the CDW phase transition, paving the way for optical-controlled novel devices based on CDW materials.
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Received: 06 March 2024
Published: 23 May 2024
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| PACS: |
71.45.Lr
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(Charge-density-wave systems)
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78.47.J-
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(Ultrafast spectroscopy (<1 psec))
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78.47.jg
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(Time resolved reflection spectroscopy)
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87.15.ht
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(Ultrafast dynamics; charge transfer)
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