Exciton g-factors in monolayer and bilayer WSe2 from experiment and theory

Jonathan Förste, Nikita V. Tepliakov, Stanislav Yu. Kruchinin, Jessica Lindlau, Victor Funk, Michael Förg, Kenji Watanabe, Takashi Taniguchi, Anvar S. Baimuratov () and Alexander Högele ()
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Jonathan Förste: Ludwig-Maximilians-Universität München
Nikita V. Tepliakov: ITMO University
Stanislav Yu. Kruchinin: University of Vienna
Jessica Lindlau: Ludwig-Maximilians-Universität München
Victor Funk: Ludwig-Maximilians-Universität München
Michael Förg: Ludwig-Maximilians-Universität München
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Anvar S. Baimuratov: Ludwig-Maximilians-Universität München
Alexander Högele: Ludwig-Maximilians-Universität München

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract The optical properties of monolayer and bilayer transition metal dichalcogenide semiconductors are governed by excitons in different spin and valley configurations, providing versatile aspects for van der Waals heterostructures and devices. Here, we present experimental and theoretical studies of exciton energy splittings in external magnetic field in neutral and charged WSe2 monolayer and bilayer crystals embedded in a field effect device for active doping control. We develop theoretical methods to calculate the exciton g-factors from first principles for all possible spin-valley configurations of excitons in monolayer and bilayer WSe2 including valley-indirect excitons. Our theoretical and experimental findings shed light on some of the characteristic photoluminescence peaks observed for monolayer and bilayer WSe2. In more general terms, the theoretical aspects of our work provide additional means for the characterization of single and few-layer transition metal dichalcogenides, as well as their heterostructures, in the presence of external magnetic fields.

Date: 2020
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DOI: 10.1038/s41467-020-18019-1

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