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The role of momentum-dark excitons in the elementary optical response of bilayer WSe2

Author

Listed:
  • Jessica Lindlau

    (Ludwig-Maximilians-Universität München)

  • Malte Selig

    (Chalmers University of Technology
    Technische Universität Berlin)

  • Andre Neumann

    (Ludwig-Maximilians-Universität München)

  • Léo Colombier

    (Ludwig-Maximilians-Universität München)

  • Jonathan Förste

    (Ludwig-Maximilians-Universität München)

  • Victor Funk

    (Ludwig-Maximilians-Universität München)

  • Michael Förg

    (Ludwig-Maximilians-Universität München)

  • Jonghwan Kim

    (University of California at Berkeley)

  • Gunnar Berghäuser

    (Chalmers University of Technology)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Feng Wang

    (University of California at Berkeley)

  • Ermin Malic

    (Chalmers University of Technology)

  • Alexander Högele

    (Ludwig-Maximilians-Universität München)

Abstract

Monolayer transition metal dichalcogenides (TMDs) undergo substantial changes in the single-particle band structure and excitonic optical response upon the addition of just one layer. As opposed to the single-layer limit, the bandgap of bilayer (BL) TMD semiconductors is indirect which results in reduced photoluminescence with richly structured spectra that have eluded a detailed understanding to date. Here, we provide a closed interpretation of cryogenic emission from BL WSe2 as a representative material for the wider class of TMD semiconductors. By combining theoretical calculations with comprehensive spectroscopy experiments, we identify the crucial role of momentum-indirect excitons for the understanding of BL TMD emission. Our results shed light on the origin of quantum dot formation in BL crystals and will facilitate further advances directed at opto-electronic applications of layered TMD semiconductors in van der Waals heterostructures and devices.

Suggested Citation

  • Jessica Lindlau & Malte Selig & Andre Neumann & Léo Colombier & Jonathan Förste & Victor Funk & Michael Förg & Jonghwan Kim & Gunnar Berghäuser & Takashi Taniguchi & Kenji Watanabe & Feng Wang & Ermin, 2018. "The role of momentum-dark excitons in the elementary optical response of bilayer WSe2," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04877-3
    DOI: 10.1038/s41467-018-04877-3
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    Cited by:

    1. Luca Sortino & Panaiot G. Zotev & Catherine L. Phillips & Alistair J. Brash & Javier Cambiasso & Elena Marensi & A. Mark Fox & Stefan A. Maier & Riccardo Sapienza & Alexander I. Tartakovskii, 2021. "Bright single photon emitters with enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Ruoming Peng & Adina Ripin & Yusen Ye & Jiayi Zhu & Changming Wu & Seokhyeong Lee & Huan Li & Takashi Taniguchi & Kenji Watanabe & Ting Cao & Xiaodong Xu & Mo Li, 2022. "Long-range transport of 2D excitons with acoustic waves," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    3. 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.
    4. Riya Sebait & Roberto Rosati & Seok Joon Yun & Krishna P. Dhakal & Samuel Brem & Chandan Biswas & Alexander Puretzky & Ermin Malic & Young Hee Lee, 2023. "Sequential order dependent dark-exciton modulation in bi-layered TMD heterostructure," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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