期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/ncomms10110
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资金
- ERC [306719]
- CNRS
- GENCI-CINES
- GENCI-IDRIS [x2015096649]
- Arizona State University
- Ira. A. Fulton College of Engineering Origami Seeding Funds
- Institut Universitaire de France
- [p0812]
- European Research Council (ERC) [306719] Funding Source: European Research Council (ERC)
Binary transition metal dichalcogenide monolayers share common properties such as a direct optical bandgap, spin-orbit splittings of hundreds of meV, light-matter interaction dominated by robust excitons and coupled spin-valley states. Here we demonstrate spin-orbit-engineering in Mo(1 - x)WxSe2 alloy monolayers for optoelectronics and applications based on spin-and valley-control. We probe the impact of the tuning of the conduction band spin-orbit spin-splitting on the bright versus dark exciton population. For MoSe2 monolayers, the photoluminescence intensity decreases as a function of temperature by an order of magnitude (4-300 K), whereas for WSe2 we measure surprisingly an order of magnitude increase. The ternary material shows a trend between these two extreme behaviours. We also show a non-linear increase of the valley polarization as a function of tungsten concentration, where 40% tungsten incorporation is sufficient to achieve valley polarization as high as in binary WSe2.
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