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


ABSTRACT: Van der Waals heterostructures formed by two different monolayer semiconductors have emerged as a promising platform for new optoelectronic and spin/valleytronic applications. In addition to its atomically thin nature, a two-dimensional semiconductor heterostructure is distinct from its three-dimensional counterparts due to the unique coupled spin-valley physics of its constituent monolayers. Here, we report the direct observation that an optically generated spin-valley polarization in one monolayer can be transferred between layers of a two-dimensional MoSe2-WSe2 heterostructure. Using non-degenerate optical circular dichroism spectroscopy, we show that charge transfer between two monolayers conserves spin-valley polarization and is only weakly dependent on the twist angle between layers. Our work points to a new spin-valley pumping scheme in nanoscale devices, provides a fundamental understanding of spin-valley transfer across the two-dimensional interface, and shows the potential use of two-dimensional semiconductors as a spin-valley generator in two-dimensional spin/valleytronic devices for storing and processing information.

SUBMITTER: Schaibley JR 

PROVIDER: S-EPMC5171822 | biostudies-other | 2016 Dec

REPOSITORIES: biostudies-other

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

Schaibley John R JR   Rivera Pasqual P   Yu Hongyi H   Seyler Kyle L KL   Yan Jiaqiang J   Mandrus David G DG   Taniguchi Takashi T   Watanabe Kenji K   Yao Wang W   Xu Xiaodong X  

Nature communications 20161214


Van der Waals heterostructures formed by two different monolayer semiconductors have emerged as a promising platform for new optoelectronic and spin/valleytronic applications. In addition to its atomically thin nature, a two-dimensional semiconductor heterostructure is distinct from its three-dimensional counterparts due to the unique coupled spin-valley physics of its constituent monolayers. Here, we report the direct observation that an optically generated spin-valley polarization in one monol  ...[more]

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