Directional interlayer spin-valley transfer in two-dimensional heterostructures

John R. Schaibley; Pasqual Rivera; Hongyi Yu; Kyle L. Seyler; Jiaqiang Yan; David G. Mandrus; Takashi Taniguchi; Kenji Watanabe; Wang Yao; Xiaodong Xu

doi:10.1038/ncomms13747

論文 Directional interlayer spin-valley transfer in two-dimensional heterostructures

John R. Schaibley ; Pasqual Rivera ; Hongyi Yu ; Kyle L. Seyler ; Jiaqiang Yan ; David G. Mandrus ; Takashi Taniguchi (National Institute for Materials Science) ; Kenji Watanabe (National Institute for Materials Science) ; Wang Yao ; Xiaodong Xu

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John R. Schaibley, Pasqual Rivera, Hongyi Yu, Kyle L. Seyler, Jiaqiang Yan, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe, Wang Yao, Xiaodong Xu. Directional interlayer spin-valley transfer in two-dimensional heterostructures. Nature Communications. 2016, 7 (1), 13747. https://doi.org/10.1038/ncomms13747

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We report the direct observation that optically generated spin-valley polarization in a monolayer can be transferred between layers of 2D MoSe2-WSe2 heterostructures. Using nondegenerate optical circular dichroism spectroscopy, we show that charge transfer between two monolayers conserves spins, which is robust against twist angle between layers. Analyzing the line shapes of the circular dichroism spectra reveals the formation of positively and negatively charged valley excitons due to spin-valley transfer in WSe2 and MoSe2, respectively. This demonstrates directional pumping of spin polarized carriers into individual layers, i.e. polarized hole spins into WSe2 and electron spins into MoSe2.

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