Abstract:
: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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Wang G,Robert C,Suslu A,Chen B,Yang S,Alamdari S,Gerber IC,Amand T,Marie X,Tongay S,Urbaszek Bdoi
10.1038/ncomms10110subject
Has Abstractpub_date
2015-12-14 00:00:00pages
10110issn
2041-1723pii
ncomms10110journal_volume
6pub_type
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