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Large valley splitting in van der Waals heterostructures with type-III band alignment
Physical Review Applied ( IF 4.532 ) Pub Date : 
Qianze Li, Ke-Qiu Chen, and Li-Ming Tang

A comparative study for spin-valley splitting of a series of van der Waals (vdW) heterostructures constructed by transition metal dichalcogenides (TMDCs) and magnetic materials has been performed by first principles calculations. It is found that the magnitude of spin-valley splitting is positively correlated the size of magnetic proximity effect closely related to Coulomb interaction, which increases with the increase of interlayer charge transfer. As a result, only when monolayer TMDCs and magnetic materials combined into type-III rather than type-I and type-II band alignment heterostructures, a large spin-valley splitting can be obtained. We demonstrated this criterion in TMDCs/NiY2 (Y=Cl, Br) vdW heterostructures by schematics of level coupling in detail, and then predicted dozens of vdW heterostructures with possible large spin-valley splitting. This discovery can help to quickly determine whether the material can achieve a large spin-valley splitting, and the predicted materials will provide good guidance for the experimentalists.
更新日期:2020-01-09

 

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