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Enhanced Valley Splitting in Monolayer WSe2 by Phase Engineering.

Haiyang Liu1, Deyi Fu1, Xu Li1

  • 1Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, People's Republic of China.

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|May 13, 2021
PubMed
Summary

Phase engineering of tungsten diselenide (WSe2) enhances valley splitting for information processing. This strategy modifies the lattice structure, offering a tunable solution for lifting valley degeneracy in 2D materials.

Keywords:
2D transition metal dichalcogenidesH phaseT phasephase transitionvalleytronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional transition metal dichalcogenides (TMDs) exhibit valley degeneracy, hindering their use in spintronics and quantum information processing.
  • Existing methods to lift valley degeneracy, such as magnetic substrates or doping, have limitations.
  • Monolayer WSe2 possesses distinct H and T phases with potential for valley manipulation.

Purpose of the Study:

  • To investigate a novel phase engineering strategy for enhancing valley splitting in monolayer WSe2.
  • To explore the tunability of valley splitting by controlling the concentration of hybrid H and T phases.
  • To elucidate the underlying physical mechanisms responsible for the enhanced valley splitting.

Main Methods:

  • Fabrication of hybrid H and T phase WSe2 structures.
  • Characterization using temperature and magnetic field dependent polarized photoluminescence spectroscopy.
  • Theoretical simulations to analyze the electronic and magnetic properties.

Main Results:

  • Achieved tunable valley splitting in hybrid H and T phase WSe2, dependent on T phase concentration.
  • Observed a valley splitting of ~4.1 meV at 31% T phase concentration under ±5 T magnetic fields.
  • Determined an effective Landé g_eff factor of -14, a 3.5-fold increase compared to pure H-WSe2.
  • Identified enhanced valley splitting primarily due to exchange interactions between H phase WSe2 and T phase-induced local magnetic moments.

Conclusions:

  • Phase engineering offers a facile and effective method for lifting valley degeneracy in 2D materials.
  • Hybrid H and T phase WSe2 exhibits significantly enhanced and tunable valley splitting.
  • The findings pave the way for advanced applications of TMDs in valleytronics and information processing.