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Ultrafast pseudospin quantum beats in multilayer WSe2 and MoSe2

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  • Simon Raiber

    (Institut für Experimentelle und Angewandte Physik, Universität Regensburg)

  • Paulo E. Faria Junior

    (Institut für Theoretische Physik, Universität Regensburg)

  • Dennis Falter

    (Institut für Experimentelle und Angewandte Physik, Universität Regensburg)

  • Simon Feldl

    (Institut für Experimentelle und Angewandte Physik, Universität Regensburg)

  • Petter Marzena

    (Institut für Experimentelle und Angewandte Physik, Universität Regensburg)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Jaroslav Fabian

    (Institut für Theoretische Physik, Universität Regensburg)

  • Christian Schüller

    (Institut für Experimentelle und Angewandte Physik, Universität Regensburg)

Abstract

Layered van-der-Waals materials with hexagonal symmetry offer an extra degree of freedom to their electrons, the so-called valley index or valley pseudospin, which behaves conceptually like the electron spin. Here, we present investigations of excitonic transitions in mono- and multilayer WSe2 and MoSe2 materials by time-resolved Faraday ellipticity (TRFE) with in-plane magnetic fields, B∥, of up to 9 T. In monolayer samples, the measured TRFE time traces are almost independent of B∥, which confirms a close to zero in-plane exciton g factor g∥, consistent with first-principles calculations. In contrast, we observe pronounced temporal oscillations in multilayer samples for B∥ > 0. Our first-principles calculations confirm the presence of a non-zero g∥ for the multilayer samples. We propose that the oscillatory TRFE signal in the multilayer samples is caused by pseudospin quantum beats of excitons, which is a manifestation of spin- and pseudospin layer locking in the multilayer samples.

Suggested Citation

  • Simon Raiber & Paulo E. Faria Junior & Dennis Falter & Simon Feldl & Petter Marzena & Kenji Watanabe & Takashi Taniguchi & Jaroslav Fabian & Christian Schüller, 2022. "Ultrafast pseudospin quantum beats in multilayer WSe2 and MoSe2," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32534-3
    DOI: 10.1038/s41467-022-32534-3
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    References listed on IDEAS

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    4. Ashish Arora & Matthias Drüppel & Robert Schmidt & Thorsten Deilmann & Robert Schneider & Maciej R. Molas & Philipp Marauhn & Steffen Michaelis de Vasconcellos & Marek Potemski & Michael Rohlfing & Ru, 2017. "Interlayer excitons in a bulk van der Waals semiconductor," Nature Communications, Nature, vol. 8(1), pages 1-6, December.
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