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  • Berghäuser, Gunnar,1983Chalmers tekniska högskola,Chalmers University of Technology (author)

Inverted valley polarization in optically excited transition metal dichalcogenides

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2018-03-06
  • Springer Science and Business Media LLC,2018
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:839a84f4-188d-4c7a-898b-df93b215d668
  • https://research.chalmers.se/publication/501273URI
  • https://doi.org/10.1038/s41467-018-03354-1DOI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Large spin-orbit coupling in combination with circular dichroism allows access to spin-polarized and valley-polarized states in a controlled way in transition metal dichalcogenides. The promising application in spin-valleytronics devices requires a thorough understanding of intervalley coupling mechanisms, which determine the lifetime of spin and valley polarizations. Here we present a joint theory-experiment study shedding light on the Dexter-like intervalley coupling. We reveal that this mechanism couples A and B excitonic states in different valleys, giving rise to an efficient intervalley transfer of coherent exciton populations. We demonstrate that the valley polarization vanishes and is even inverted for A excitons, when the B exciton is resonantly excited and vice versa. Our theoretical findings are supported by energy-resolved and valley-resolved pump-probe experiments and also provide an explanation for the recently measured up-conversion in photoluminescence. The gained insights might help to develop strategies to overcome the intrinsic limit for spin and valley polarizations.

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  • Bernal, Ivan,1984Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bivan (author)
  • Schmidt, RobertWestfaelische Wilhelms-Universität Münster,University of Münster (author)
  • Schneider, R.Westfaelische Wilhelms-Universität Münster,University of Münster (author)
  • Niehues, IrisWestfaelische Wilhelms-Universität Münster,University of Münster (author)
  • Erhart, Paul,1978Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)erhart (author)
  • de Vasconcellos, S. M.Westfaelische Wilhelms-Universität Münster,University of Münster (author)
  • Bratschitsch, R.Westfaelische Wilhelms-Universität Münster,University of Münster (author)
  • Knorr, A.Technische Universität Berlin (author)
  • Malic, Ermin,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ermin (author)
  • Chalmers tekniska högskolaWestfaelische Wilhelms-Universität Münster (creator_code:org_t)

Related titles

  • In:Nature Communications: Springer Science and Business Media LLC9:12041-17232041-1723

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