Temperature-induced valley polarization in WS2 heterostructures

Davoud Adinehloo

doi:10.1117/12.2611888

27 August 2021 Temperature-induced valley polarization in WS2 heterostructures

Davoud Adinehloo

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Proceedings Volume 11918, Photonics for Quantum 2020; 119180Y (2021) https://doi.org/10.1117/12.2611888
Event: Photonics for Quantum 2020, 2021, Online Only

Abstract

We investigate the temperature dependence of valley polarization in WS2 heterostructures. WS2 layer is considered as an optically active material. The influence of heterostructures of different materials on the degree of valley polarization is depicted. The results indicate that unlike interaction in WS2 encapsulated with hBN, the interaction between WS2 and graphene has an intense impact on the temperature dependence depolarization. Furthermore, intervalley scattering rates under resonant and non-resonant excitation energy as the crucial parameters to see the temperature dependence by considering Fröhlich coupling are calculated. The results show the scattering rate is almost independent of temperature due to large phonon energy. Subsequently, the major contribution of observed valley depolarization should come from the change in the radiative lifetime.

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Davoud Adinehloo "Temperature-induced valley polarization in WS2 heterostructures", Proc. SPIE 11918, Photonics for Quantum 2020, 119180Y (27 August 2021); https://doi.org/10.1117/12.2611888

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