Physical Review Letters· 2012Q1
Coupled Spin and Valley Physics in Monolayers of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>MoS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>and Other Group-VI Dichalcogenides
- 5,070citations
- Q1SCImago
- 2012year
Short summary
Researchers have demonstrated coupled spin and valley physics in 2D materials like MoS2, enabling control over spin and valley properties. This coupling suppresses relaxation, allowing for unique optical control and potential integration of spintronics and valleytronics.
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Key points
- Inversion symmetry breaking and spin-orbit coupling enable coupled spin and valley physics in 2D dichalcogenides.
- Spin-valley coupling suppresses spin and valley relaxation, allowing for longer-lived accumulations.
- Valley Hall and spin Hall effects are observed in both electron- and hole-doped systems.
- Frequency-dependent optical transitions allow selective photoexcitation of carriers based on spin and valley indices.
AI-generated from the title and abstract; the full text is not read.
Abstract
We show that inversion symmetry breaking together with spin-orbit coupling leads to coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides, making possible controls of spin and valley in these 2D materials. The spin-valley coupling at the valence-band edges suppresses spin and valley relaxation, as flip of each index alone is forbidden by the valley-contrasting spin splitting. Valley Hall and spin Hall effects coexist in both electron-doped and hole-doped systems. Optical interband transitions have frequency-dependent polarization selection rules which allow selective photoexcitation of carriers with various combination of valley and spin indices. Photoinduced spin Hall and valley Hall effects can generate long lived spin and valley accumulations on sample boundaries. The physics discussed here provides a route towards the integration of valleytronics and spintronics in multivalley materials with strong spin-orbit coupling and inversion symmetry breaking.
The authors' abstract, as published at the source. Physical Review Letters, 2012 · DOI ↗
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Field: Materials Chemistry
Materials ChemistryMaterials Science