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Electrically tunable layer-hybridized trions in doped WSe2 bilayers

Author

Listed:
  • Raul Perea-Causin

    (Chalmers University of Technology
    Stockholm University)

  • Samuel Brem

    (Philipps-Universität Marburg)

  • Fabian Buchner

    (University of Regensburg)

  • Yao Lu

    (College of Chemistry and Chemical Engineering, Xiamen University)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • John M. Lupton

    (University of Regensburg)

  • Kai-Qiang Lin

    (University of Regensburg
    College of Chemistry and Chemical Engineering, Xiamen University)

  • Ermin Malic

    (Philipps-Universität Marburg)

Abstract

Doped van der Waals heterostructures host layer-hybridized trions, i.e. charged excitons with layer-delocalized constituents holding promise for highly controllable optoelectronics. Combining a microscopic theory with photoluminescence (PL) experiments, we demonstrate the electrical tunability of the trion energy landscape in naturally stacked WSe2 bilayers. We show that an out-of-plane electric field modifies the energetic ordering of the lowest lying trion states, which consist of layer-hybridized $$\Lambda$$ Λ -point electrons and layer-localized K-point holes. At small fields, intralayer-like trions yield distinct PL signatures in opposite doping regimes characterized by weak Stark shifts in both cases. Above a doping-asymmetric critical field, interlayer-like species are energetically favored and produce PL peaks with a pronounced Stark red-shift and a counter-intuitively large intensity arising from efficient phonon-assisted recombination. Our work presents an important step forward in the microscopic understanding of layer-hybridized trions in van der Waals heterostructures and paves the way towards optoelectronic applications based on electrically controllable atomically-thin semiconductors.

Suggested Citation

  • Raul Perea-Causin & Samuel Brem & Fabian Buchner & Yao Lu & Kenji Watanabe & Takashi Taniguchi & John M. Lupton & Kai-Qiang Lin & Ermin Malic, 2024. "Electrically tunable layer-hybridized trions in doped WSe2 bilayers," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50834-8
    DOI: 10.1038/s41467-024-50834-8
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    References listed on IDEAS

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