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

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arxiv 2110.13007 v1 pith:MMCWCG5F submitted 2021-10-25 cond-mat.mtrl-sci cond-mat.mes-hall

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

classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords mose2whencircularpolarizationbuild-upchargehybridmagnetization
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present magneto-photoluminescence measurements in a hybrid 2D semiconductor/ferromagnetic structure consisting of MoSe2/hBN/Ni. When the Nickel layer is magnetized, we observe circularly polarized photoluminescence of the trion peak in 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.

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