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Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2

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  • Zhipeng Li

    (Rensselaer Polytechnic Institute
    Shanghai Jiao Tong University)

  • Tianmeng Wang

    (Rensselaer Polytechnic Institute)

  • Zhengguang Lu

    (National High Magnetic Field Lab
    Florida State University)

  • Chenhao Jin

    (University of California)

  • Yanwen Chen

    (Rensselaer Polytechnic Institute)

  • Yuze Meng

    (Rensselaer Polytechnic Institute
    Nanjing University)

  • Zhen Lian

    (Rensselaer Polytechnic Institute)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Shengbai Zhang

    (Rensselaer Polytechnic Institute)

  • Dmitry Smirnov

    (National High Magnetic Field Lab)

  • Su-Fei Shi

    (Rensselaer Polytechnic Institute
    Rensselaer Polytechnic Institute)

Abstract

Strong Coulomb interactions in single-layer transition metal dichalcogenides (TMDs) result in the emergence of strongly bound excitons, trions, and biexcitons. These excitonic complexes possess the valley degree of freedom, which can be exploited for quantum optoelectronics. However, in contrast to the good understanding of the exciton and trion properties, the binding energy of the biexciton remains elusive, with theoretical calculations and experimental studies reporting discrepant results. In this work, we resolve the conflict by employing low-temperature photoluminescence spectroscopy to identify the biexciton state in BN-encapsulated single-layer WSe2. The biexciton state only exists in charge-neutral WSe2, which is realized through the control of efficient electrostatic gating. In the lightly electron-doped WSe2, one free electron binds to a biexciton and forms the trion–exciton complex. Improved understanding of the biexciton and trion–exciton complexes paves the way for exploiting the many-body physics in TMDs for novel optoelectronics applications.

Suggested Citation

  • Zhipeng Li & Tianmeng Wang & Zhengguang Lu & Chenhao Jin & Yanwen Chen & Yuze Meng & Zhen Lian & Takashi Taniguchi & Kenji Watanabe & Shengbai Zhang & Dmitry Smirnov & Su-Fei Shi, 2018. "Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05863-5
    DOI: 10.1038/s41467-018-05863-5
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    Cited by:

    1. Meng Zhao & Zhongjie Wang & Lu Liu & Chunzheng Wang & Cheng-Yen Liu & Fang Yang & Hua Wu & Chunlei Gao, 2024. "Atomic-scale visualization of the interlayer Rydberg exciton complex in moiré heterostructures," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Kai-Qiang Lin & Jonas D. Ziegler & Marina A. Semina & Javid V. Mamedov & Kenji Watanabe & Takashi Taniguchi & Sebastian Bange & Alexey Chernikov & Mikhail M. Glazov & John M. Lupton, 2022. "High-lying valley-polarized trions in 2D semiconductors," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    3. Xiaotong Chen & Zhen Lian & Yuze Meng & Lei Ma & Su-Fei Shi, 2023. "Excitonic Complexes in Two-Dimensional Transition Metal Dichalcogenides," Nature Communications, Nature, vol. 14(1), pages 1-5, December.
    4. M. Iqbal Bakti Utama & Hongfei Zeng & Tumpa Sadhukhan & Anushka Dasgupta & S. Carin Gavin & Riddhi Ananth & Dmitry Lebedev & Wei Wang & Jia-Shiang Chen & Kenji Watanabe & Takashi Taniguchi & Tobin J. , 2023. "Chemomechanical modification of quantum emission in monolayer WSe2," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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