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Microsecond dark-exciton valley polarization memory in two-dimensional heterostructures

Author

Listed:
  • Chongyun Jiang

    (Nanyang Technological University)

  • Weigao Xu

    (Nanyang Technological University)

  • Abdullah Rasmita

    (Nanyang Technological University)

  • Zumeng Huang

    (Nanyang Technological University)

  • Ke Li

    (Nanyang Technological University)

  • Qihua Xiong

    (Nanyang Technological University
    Nanyang Technological University
    CNRS-Université de Nice-NUS-NTU International Joint Research Unit UMI 3654)

  • Wei-bo Gao

    (Nanyang Technological University
    CNRS-Université de Nice-NUS-NTU International Joint Research Unit UMI 3654
    Nanyang Technological University)

Abstract

Transition metal dichalcogenides have valley degree of freedom, which features optical selection rule and spin-valley locking, making them promising for valleytronics devices and quantum computation. For either application, a long valley polarization lifetime is crucial. Previous results showed that it is around picosecond in monolayer excitons, nanosecond for local excitons and tens of nanosecond for interlayer excitons. Here we show that the dark excitons in two-dimensional heterostructures provide a microsecond valley polarization memory thanks to the magnetic field induced suppression of valley mixing. The lifetime of the dark excitons shows magnetic field and temperature dependence. The long lifetime and valley polarization lifetime of the dark exciton in two-dimensional heterostructures make them promising for long-distance exciton transport and macroscopic quantum state generations.

Suggested Citation

  • Chongyun Jiang & Weigao Xu & Abdullah Rasmita & Zumeng Huang & Ke Li & Qihua Xiong & Wei-bo Gao, 2018. "Microsecond dark-exciton valley polarization memory in two-dimensional heterostructures," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03174-3
    DOI: 10.1038/s41467-018-03174-3
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    Cited by:

    1. Qing-Hai Tan & Yun-Mei Li & Jia-Min Lai & Yu-Jia Sun & Zhe Zhang & Feilong Song & Cedric Robert & Xavier Marie & Weibo Gao & Ping-Heng Tan & Jun Zhang, 2023. "Quantum interference between dark-excitons and zone-edged acoustic phonons in few-layer WS2," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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