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
Full Article | PDF ArticleMore Like This
Lingkai Cao, Jiahong Zhong, Juan Yu, Cheng Zeng, Junnan Ding, Chunxiao Cong, Xiaofei Yue, Zongwen Liu, and Yanping Liu
Opt. Express 28(15) 22135-22143 (2020)
Haihong Zheng, Biao Wu, Shaofei Li, Jun He, Zongwen Liu, Chang-Tian Wang, Jian-Tao Wang, Ji-an Duan, and Yanping Liu
Opt. Lett. 48(9) 2393-2396 (2023)
Xijun Wu, Chunyao Zhang, Hongxin Ge, H. Liu, Zhencheng Shang, and Yudong Niu
Opt. Lett. 47(5) 1267-1270 (2022)