Biaxial strain on the Rashba spin splitting and optical absorption of MoSSe/WSe2 heterostructures

Wenhua Xuan; Hai Yang; Guojun Jin

doi:10.1117/12.2662009

12 April 2023 Biaxial strain on the Rashba spin splitting and optical absorption of MoSSe/WSe₂ heterostructures

Wenhua Xuan, Hai Yang, Guojun Jin

Proceedings Volume 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022); 1256516 (2023) https://doi.org/10.1117/12.2662009
Event: Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 2022, Shanghai, China

Abstract

This work uses the first-principles calculation method to systematically investigate the Rashba spin splitting and optical properties of MoSSe/WSe₂ heterostructures under biaxial strain. The results show that, firstly, the most stable MoSSe/WSe₂ heterostructure has a type II band arrangement with a direct band gap of 0.47eV, which is conducive to the separation of photogenerated electron-hole pairs. Secondly, for spin-orbit coupling, the Rashba spin splitting occurs at the Γ point, an applying biaxial strain can suppress the strength of its Rashba splitting by tensile strain and promote the strength of its Rashba splitting by compressive strain. Thirdly, the MoSSe/WSe₂ heterostructure has higher optical absorption coefficients than the two monolayers, and the absorption spectrum undergoes a red-shift and a blue-shift under strain. These results suggest that the MoSSe/WSe₂ heterostructure has potential applications in spintronics and optoelectronic devices.

Citation Download Citation

Wenhua Xuan, Hai Yang, and Guojun Jin "Biaxial strain on the Rashba spin splitting and optical absorption of MoSSe/WSe₂ heterostructures", Proc. SPIE 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 1256516 (12 April 2023); https://doi.org/10.1117/12.2662009

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