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Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer

Author

Listed:
  • Hongbing Cai

    (Nanyang Technological University
    Nanyang Technological University)

  • Abdullah Rasmita

    (Nanyang Technological University)

  • Qinghai Tan

    (Nanyang Technological University)

  • Jia-Min Lai

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Ruihua He

    (Nanyang Technological University)

  • Xiangbin Cai

    (Nanyang Technological University)

  • Yan Zhao

    (Nanyang Technological University)

  • Disheng Chen

    (Nanyang Technological University
    Nanyang Technological University)

  • Naizhou Wang

    (Nanyang Technological University)

  • Zhao Mu

    (Nanyang Technological University)

  • Zumeng Huang

    (Nanyang Technological University)

  • Zhaowei Zhang

    (Nanyang Technological University)

  • John J. H. Eng

    (Nanyang Technological University
    Agency for Science, Technology and Research)

  • Yuanda Liu

    (Nanyang Technological University
    Nanyang Technological University)

  • Yongzhi She

    (University of Science and Technology of China)

  • Nan Pan

    (University of Science and Technology of China)

  • Yansong Miao

    (Nanyang Technological University)

  • Xiaoping Wang

    (University of Science and Technology of China)

  • Xiaogang Liu

    (National University of Singapore)

  • Jun Zhang

    (Chinese Academy of Sciences)

  • Weibo Gao

    (Nanyang Technological University
    Nanyang Technological University
    National University of Singapore)

Abstract

Localized interlayer excitons (LIXs) in two-dimensional moiré superlattices exhibit sharp and dense emission peaks, making them promising as highly tunable single-photon sources. However, the fundamental nature of these LIXs is still elusive. Here, we show the donor-acceptor pair (DAP) mechanism as one of the origins of these excitonic peaks. Numerical simulation results of the DAP model agree with the experimental photoluminescence spectra of LIX in the moiré MoSe2/WSe2 heterobilayer. In particular, we find that the emission energy-lifetime correlation and the nonmonotonic power dependence of the lifetime agree well with the DAP IX model. Our results provide insight into the physical mechanism of LIX formation in moiré heterostructures and pave new directions for engineering interlayer exciton properties in moiré superlattices.

Suggested Citation

  • Hongbing Cai & Abdullah Rasmita & Qinghai Tan & Jia-Min Lai & Ruihua He & Xiangbin Cai & Yan Zhao & Disheng Chen & Naizhou Wang & Zhao Mu & Zumeng Huang & Zhaowei Zhang & John J. H. Eng & Yuanda Liu &, 2023. "Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41330-6
    DOI: 10.1038/s41467-023-41330-6
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    1. Hanlin Fang & Qiaoling Lin & Yi Zhang & Joshua Thompson & Sanshui Xiao & Zhipei Sun & Ermin Malic & Saroj P. Dash & Witlef Wieczorek, 2023. "Localization and interaction of interlayer excitons in MoSe2/WSe2 heterobilayers," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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