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Tuning the Fröhlich exciton-phonon scattering in monolayer MoS2

Author

Listed:
  • Bastian Miller

    (Technical University of Munich
    Nanosystems Initiative Munich (NIM))

  • Jessica Lindlau

    (Nanosystems Initiative Munich (NIM)
    Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1)

  • Max Bommert

    (Technical University of Munich)

  • Andre Neumann

    (Nanosystems Initiative Munich (NIM)
    Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1)

  • Hisato Yamaguchi

    (Los Alamos National Laboratory (LANL))

  • Alexander Holleitner

    (Technical University of Munich
    Nanosystems Initiative Munich (NIM)
    Munich Center for Quantum Science and Technology (MCQST))

  • Alexander Högele

    (Nanosystems Initiative Munich (NIM)
    Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1
    Munich Center for Quantum Science and Technology (MCQST))

  • Ursula Wurstbauer

    (Technical University of Munich
    Nanosystems Initiative Munich (NIM)
    University of Münster)

Abstract

Charge carriers in semiconducting transition metal dichalcogenides possess a valley degree of freedom that allows for optoelectronic applications based on the momentum of excitons. At elevated temperatures, scattering by phonons limits valley polarization, making a detailed knowledge about strength and nature of the interaction of excitons with phonons essential. In this work, we directly access exciton-phonon coupling in charge tunable single layer MoS2 devices by polarization resolved Raman spectroscopy. We observe a strong defect mediated coupling between the long-range oscillating electric field induced by the longitudinal optical phonon in the dipolar medium and the exciton. This so-called Fröhlich exciton phonon interaction is suppressed by doping. The suppression correlates with a distinct increase of the degree of valley polarization up to 20% even at elevated temperatures of 220 K. Our result demonstrates a promising strategy to increase the degree of valley polarization towards room temperature valleytronic applications.

Suggested Citation

  • Bastian Miller & Jessica Lindlau & Max Bommert & Andre Neumann & Hisato Yamaguchi & Alexander Holleitner & Alexander Högele & Ursula Wurstbauer, 2019. "Tuning the Fröhlich exciton-phonon scattering in monolayer MoS2," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-08764-3
    DOI: 10.1038/s41467-019-08764-3
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