Spin-orbit engineering in transition metal dichalcogenide alloy monolayers

Gang Wang, Cedric Robert, Aslihan Suslu, Bin Chen, Sijie Yang, Sarah Alamdari, Iann C. Gerber, Thierry Amand, Xavier Marie, Sefaattin Tongay*, Bernhard Urbaszek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

162 Scopus citations


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.

Original languageEnglish (US)
Article number10110
JournalNature communications
StatePublished - 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)


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