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Emerging photoluminescence from the dark-exciton phonon replica in monolayer WSe2

Author

Listed:
  • Zhipeng Li

    (Rensselaer Polytechnic Institute
    Shanghai Jiao Tong University)

  • Tianmeng Wang

    (Rensselaer Polytechnic Institute)

  • Chenhao Jin

    (Kavli Institute at Cornell for Nanoscale Science)

  • Zhengguang Lu

    (National High Magnetic Field Lab
    Florida State University)

  • Zhen Lian

    (Rensselaer Polytechnic Institute)

  • Yuze Meng

    (Rensselaer Polytechnic Institute
    Nanjing University)

  • Mark Blei

    (Arizona State University)

  • Shiyuan Gao

    (Washington University in St. Louis)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Tianhui Ren

    (Shanghai Jiao Tong University)

  • Sefaattin Tongay

    (Arizona State University)

  • Li Yang

    (Washington University in St. Louis)

  • Dmitry Smirnov

    (National High Magnetic Field Lab)

  • Ting Cao

    (Stanford University
    University of Washington)

  • Su-Fei Shi

    (Rensselaer Polytechnic Institute
    Rensselaer Polytechnic Institute)

Abstract

Tungsten-based monolayer transition metal dichalcogenides host a long-lived “dark” exciton, an electron-hole pair in a spin-triplet configuration. The long lifetime and unique spin properties of the dark exciton provide exciting opportunities to explore light-matter interactions beyond electric dipole transitions. Here we demonstrate that the coupling of the dark exciton and an optically silent chiral phonon enables the intrinsic photoluminescence of the dark-exciton replica in monolayer WSe2. Gate and magnetic-field dependent PL measurements unveil a circularly-polarized replica peak located below the dark exciton by 21.6 meV, equal to E″ phonon energy from Se vibrations. First-principles calculations show that the exciton-phonon interaction selectively couples the spin-forbidden dark exciton to the intravalley spin-allowed bright exciton, permitting the simultaneous emission of a chiral phonon and a circularly-polarized photon. Our discovery and understanding of the phonon replica reveals a chirality dictated emission channel of the phonons and photons, unveiling a new route of manipulating valley-spin.

Suggested Citation

  • Zhipeng Li & Tianmeng Wang & Chenhao Jin & Zhengguang Lu & Zhen Lian & Yuze Meng & Mark Blei & Shiyuan Gao & Takashi Taniguchi & Kenji Watanabe & Tianhui Ren & Sefaattin Tongay & Li Yang & Dmitry Smir, 2019. "Emerging photoluminescence from the dark-exciton phonon replica in monolayer WSe2," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10477-6
    DOI: 10.1038/s41467-019-10477-6
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    Cited by:

    1. Xin Cong & Parisa Ali Mohammadi & Mingyang Zheng & Kenji Watanabe & Takashi Taniguchi & Daniel Rhodes & Xiao-Xiao Zhang, 2023. "Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Niclas S. Mueller & Rakesh Arul & Gyeongwon Kang & Ashley P. Saunders & Amalya C. Johnson & Ana Sánchez-Iglesias & Shu Hu & Lukas A. Jakob & Jonathan Bar-David & Bart Nijs & Luis M. Liz-Marzán & Fang , 2023. "Photoluminescence upconversion in monolayer WSe2 activated by plasmonic cavities through resonant excitation of dark excitons," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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