期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms13747
关键词
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资金
- Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-SC0008145, SC0012509]
- Croucher Foundation (Croucher Innovation Award)
- RGC of Hong Kong [HKU17305914P]
- HKU ORA
- US DoE, BES, Materials Sciences and Engineering Division
- Elemental Strategy Initiative
- JSPS
- State of Washington
- Cottrell Scholar Award
- Boeing Distinguished Professorship in Physics
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.
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