Giant valley polarization splitting and circular dichroism response in WS2/CrBr3 heterostructure via ultrafast spin-charge transfer (IMAGE)

Tsinghua University Press

Giant valley polarization splitting and circular dichroism response in WS2/CrBr3 heterostructure via ultrafast spin-charge transfer

Caption

In this work, we report a method for controlling interlayer spin-charge transfer in WS2/CrBr3 heterostructure through the proximity coupling of graphene and achieve a giant chirality-dependent valley polarization splitting. The spin-charge transfer time between WS2 and CrBr3 in WS2/CrBr3 heterostructure is reduced from 17.3 ps to 1.3 ps when it is coupled with a few-layered graphene, while the maximum valley polarization and polarization splitting of trion excitons in WS2 are enhanced by 32% and 261%, respectively.

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Nano Research, Tsinghua University Press

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