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Spin Accumulation and Dynamics in Inversion-Symmetric van der Waals Crystals
1Department of Applied Physics, Eindhoven University of Technology, Eindhoven, Netherlands.
Physical Review Letters
|July 14, 2018
Summary
Spin-layer polarization in van der Waals materials like WSe2 and MoSe2 was investigated. Researchers found phonon scattering limits relaxation in WSe2, while interlayer hopping is tunable by magnetic fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Inversion-symmetric materials typically lack overall spin texture under time-reversal symmetry.
- Van der Waals materials lacking inversion symmetry can exhibit layer-dependent spin textures, coupling spin and layer degrees of freedom.
Purpose of the Study:
- To investigate spin-layer polarization and its dynamics in inversion-symmetric WSe2 and MoSe2 bulk crystals.
- To understand the mechanisms governing spin-layer relaxation and the influence of external factors.
Main Methods:
- Time-resolved Kerr rotation spectroscopy was employed.
- Measurements were conducted on WSe2 and MoSe2 bulk crystals.
Main Results:
- Spin-layer relaxation time in WSe2 is limited by phonon scattering at high temperatures.
- Interlayer hopping in WSe2 can be tuned by in-plane magnetic fields at low temperatures, affecting relaxation rates.
- MoSe2 exhibits a significantly lower spin-layer lifetime compared to WSe2, consistent with theoretical predictions.
Conclusions:
- Spin-layer polarization dynamics are influenced by temperature, phonon scattering, and magnetic fields in WSe2.
- The enhanced spin-orbit coupling in WSe2 stabilizes spin-layer polarization, leading to longer lifetimes compared to MoSe2.
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