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Updated: Mar 12, 2026
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
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Valley modulation in WSe2/VSe2heterostructures via phase engineering.
Zilong Chen1, Zongnan Zhang1,2, Chunmiao Zhang1
1Department of Physics, Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices at Education Ministry, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China.
Summary
This study explores controlling spin-valley properties in transition metal dichalcogenide (TMD) heterostructures. Vertical strain significantly enhances valley splitting in WSe2/VSe2, crucial for future valleytronics applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Valleytronics aims to control electron valley degrees of freedom for novel electronic devices.
- Transition metal dichalcogenides (TMDs) are promising materials for valleytronics due to their unique spin-valley coupling.
- Understanding and manipulating spin-valley characteristics in TMD heterostructures is crucial for technological advancement.
Purpose of the Study:
- To systematically compare and manipulate the spin-valley characteristics of WSe2/2H(1T)-VSe2 heterostructures.
- To investigate the effects of phase engineering and strain on valley splitting in these heterostructures.
- To provide insights into controlling spin-valley properties for valleytronics applications.
Main Methods:
- First-principles calculations were employed to investigate WSe2/2H(1T)-VSe2 heterostructures.
- Systematic comparison of spin-valley characteristics was performed.
- Strain engineering (vertical and biaxial) was utilized to modulate valley splitting.
Main Results:
- Significant valley modulation was observed in WSe2/1T-VSe2 heterostructures due to phase-related band hybridization.
- Band hybridization was attributed to work function differences and orbital characteristics.
- Vertical strain significantly enhanced valley splitting, reaching 172.2 meV in WSe2/1T-VSe2 due to proximity effects and band hybridization.
Conclusions:
- Phase engineering in WSe2/VSe2 heterostructures offers a pathway to control spin-valley properties.
- Vertical strain is an effective method for enhancing valley splitting in these systems.
- This research provides valuable insights for designing next-generation valleytronic devices.
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