Spin dependent charge transfer in MoSe2/hBN/Ni hybrid structures

We present magneto-photoluminescence measurements in a hybrid two-dimensional semiconductor/ferromagnetic structure consisting of MoSe2/hBN/Ni. When the nickel layer is magnetized, we observe circularly polarized photoluminescence of the trion peak in the MoSe2 monolayer under linearly polarized exc...

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Bibliographic Details
Published in:Applied physics letters 2021-12, Vol.119 (26)
Main Authors: Tornatzky, H., Robert, C., Renucci, P., Han, B., Blon, T., Lassagne, B., Ballon, G., Lu, Y., Watanabe, K., Taniguchi, T., Urbaszek, B., Lopes, J. M. J., Marie, X.
Format: Article
Language:English
Subjects:
Accumulation
Applied physics
Charge transfer
Circular polarization
Ferromagnetism
Hybrid structures
Linear polarization
Magnetization
Molybdenum compounds
Monolayers
Nickel
Photoluminescence
Trions
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Summary:We present magneto-photoluminescence measurements in a hybrid two-dimensional semiconductor/ferromagnetic structure consisting of MoSe2/hBN/Ni. When the nickel layer is magnetized, we observe circularly polarized photoluminescence of the trion peak in the MoSe2 monolayer under linearly polarized excitation. This build-up of circular polarization can reach a measured value of about 4% when the magnetization of Ni is saturated perpendicularly to the sample plane and changes its sign when the magnetization is reversed. The circular polarization decreases when the hBN barrier thickness increases. These results are interpreted in terms of a spin-dependent charge transfer between the MoSe2 monolayer and the nickel film. The build-up of circular polarization is observed up to 120 K, mainly limited by the trion emission that vanishes with temperature.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0075554