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Dissociation of two-dimensional excitons in monolayer WSe2

Author

Listed:
  • Mathieu Massicotte

    (The Barcelona Institute of Science and Technology)

  • Fabien Vialla

    (The Barcelona Institute of Science and Technology)

  • Peter Schmidt

    (The Barcelona Institute of Science and Technology)

  • Mark B. Lundeberg

    (The Barcelona Institute of Science and Technology)

  • Simone Latini

    (Technical University of Denmark
    Technical University of Denmark)

  • Sten Haastrup

    (Technical University of Denmark)

  • Mark Danovich

    (University of Manchester)

  • Diana Davydovskaya

    (The Barcelona Institute of Science and Technology)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Vladimir I. Fal’ko

    (Technical University of Denmark)

  • Kristian S. Thygesen

    (Technical University of Denmark
    Technical University of Denmark)

  • Thomas G. Pedersen

    (Aalborg University
    Center for Nanostructured Graphene (CNG))

  • Frank H. L. Koppens

    (The Barcelona Institute of Science and Technology
    ICREA – Institució Catalana de Recerça i Estudis Avancats)

Abstract

Two-dimensional (2D) semiconducting materials are promising building blocks for optoelectronic applications, many of which require efficient dissociation of excitons into free electrons and holes. However, the strongly bound excitons arising from the enhanced Coulomb interaction in these monolayers suppresses the creation of free carriers. Here, we identify the main exciton dissociation mechanism through time and spectrally resolved photocurrent measurements in a monolayer WSe2 p–n junction. We find that under static in-plane electric field, excitons dissociate at a rate corresponding to the one predicted for tunnel ionization of 2D Wannier–Mott excitons. This study is essential for understanding the photoresponse of 2D semiconductors and offers design rules for the realization of efficient photodetectors, valley dependent optoelectronics, and novel quantum coherent phases.

Suggested Citation

  • Mathieu Massicotte & Fabien Vialla & Peter Schmidt & Mark B. Lundeberg & Simone Latini & Sten Haastrup & Mark Danovich & Diana Davydovskaya & Kenji Watanabe & Takashi Taniguchi & Vladimir I. Fal’ko & , 2018. "Dissociation of two-dimensional excitons in monolayer WSe2," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03864-y
    DOI: 10.1038/s41467-018-03864-y
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    Cited by:

    1. Juan Francisco Gonzalez Marin & Dmitrii Unuchek & Zhe Sun & Cheol Yeon Cheon & Fedele Tagarelli & Kenji Watanabe & Takashi Taniguchi & Andras Kis, 2022. "Room-temperature electrical control of polarization and emission angle in a cavity-integrated 2D pulsed LED," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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