Description

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

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 behaviors. 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.

Reuse Permissions
  • Downloads
    PDF (736.4 KB)
    Download count: 1

    Details

    Title
    • Spin-Orbit Engineering in Transition Metal Dichalcogenide Alloy Monolayers
    Contributors
    Date Created
    2015-12-14
    Resource Type
  • Text
  • Collections this item is in
    Identifier
    • Digital object identifier: 10.1038/ncomms10110
    • Identifier Type
      International standard serial number
      Identifier Value
      2041-1723
    Note
    • The final version of this article, as published in Nature Communications, can be viewed online at: https://www.nature.com/articles/ncomms10110

    Citation and reuse

    Cite this item

    This is a suggested citation. Consult the appropriate style guide for specific citation guidelines.

    Wang, G., Robert, C., Suslu, A., Chen, B., Yang, S., Alamdari, S., . . . Urbaszek, B. (2015). Spin-orbit engineering in transition metal dichalcogenide alloy monolayers. Nature Communications, 6, 10110. doi:10.1038/ncomms10110

    Machine-readable links