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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Related Experiment Video

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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.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 10, 2026
PubMed
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.

Keywords:
VSe2WSe2first-principles calculationsphase engineeringvalley splitting

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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.