Abstract

In this work, we investigate the polarization of the excitonics valley in MoS₂–WS₂ heterostructures using circular polarization-resolved photoluminescence. The valley polarization is the largest (≈28.45%) in the 1L–1L MoS₂–WS₂ heterostructure and the polarizability of ${\textrm{A}_{\textrm{W}{\textrm{S}_2}}}$ decreases as the number of WS₂ layers increases. We further observed a redshift of exciton $\textrm{X}_{\textrm{Mo}{\textrm{S}_2}}^ - $ in MoS₂–WS₂ heterostructures with the increase of WS₂ layers, which is attributed to the displacement of the MoS₂ band edge, indicating the layer-sensitive optical properties of the MoS₂–WS₂ heterostructure. Our findings shed light on the understanding of exciton behavior in multilayer MoS₂–WS₂ heterostructures that may promote their potential applications in optoelectronic devices.

© 2022 Optica Publishing Group

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