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Published on: May 15, 2017
Room-temperature electrically driven phase transition of two-dimensional 1T-TaS2 layers
Shoujun Zheng1, Fucai Liu2, Chao Zhu2
1Centre for Disruptive Photonic Technologies, Nanyang Technological University, 637371, Singapore and Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore. fanhj@ntu.edu.sg.
Thickness influences charge density wave (CDW) phase transitions in 1T-TaS₂ flakes. Thicker 2D materials exhibit multiple transitions, suggesting hidden CDW states and enabling room-temperature device applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanoscience
Background:
- 1T-TaS₂ exhibits complex charge density wave (CDW) phase transitions (PTs) driven by electron interactions.
- These transitions are sensitive to temperature and electric fields, impacting material properties.
Purpose of the Study:
- Investigate the influence of thickness on electric field-driven CDW PTs in 1T-TaS₂ 2D flakes.
- Explore the potential for room-temperature CDW-based devices.
Main Methods:
- Fabrication and electrical characterization of 1T-TaS₂ 2D flakes with varying thicknesses (≤8.8 nm, 13-17 nm, ≥17.5 nm).
- Measurement of electric field-driven PTs in the temperature range of 60-300 K.
- Fabrication of a 1T-TaS₂/graphene hybrid field-effect transistor (FET).
Main Results:
- Flake thickness dictates the number of electric field-driven PTs: single for thin, double for intermediate, and multiple for thick flakes.
- Multiple PTs suggest the presence of hidden nearly-commensurate CDW (NCCDW) states.
- A threshold electric field was observed, preventing the low-resistance state from reverting to the high-resistance state.
- A gate-tunable PT at room temperature was achieved in the 1T-TaS₂/graphene hybrid FET.
Conclusions:
- Thickness is a critical parameter controlling electric field-induced CDW phase transitions in 2D 1T-TaS₂.
- The findings suggest potential for novel electronic memory devices utilizing CDW phenomena in 2D materials.
- Hybrid structures like 1T-TaS₂/graphene offer pathways for realizing room-temperature CDW-based functionalities.
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