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Inverted valley pol...
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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 ...
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2018-03-06
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Springer Science and Business Media LLC,2018
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:839a84f4-188d-4c7a-898b-df93b215d668
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https://research.chalmers.se/publication/501273URI
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https://doi.org/10.1038/s41467-018-03354-1DOI
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Language:English
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Summary in:English
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Notes
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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)
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Schmidt, RobertWestfaelische Wilhelms-Universität Münster,University of Münster
(author)
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Schneider, R.Westfaelische Wilhelms-Universität Münster,University of Münster
(author)
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Niehues, IrisWestfaelische Wilhelms-Universität Münster,University of Münster
(author)
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Erhart, Paul,1978Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)erhart
(author)
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de Vasconcellos, S. M.Westfaelische Wilhelms-Universität Münster,University of Münster
(author)
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Bratschitsch, R.Westfaelische Wilhelms-Universität Münster,University of Münster
(author)
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Knorr, A.Technische Universität Berlin
(author)
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Malic, Ermin,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ermin
(author)
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Chalmers tekniska högskolaWestfaelische Wilhelms-Universität Münster
(creator_code:org_t)
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In:Nature Communications: Springer Science and Business Media LLC9:12041-17232041-1723
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Schmidt, Robert
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Schneider, R.
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Niehues, Iris
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de Vasconcellos, ...
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Bratschitsch, R.
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