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Long valley lifetime of dark excitons in single-layer WSe2

Author

Listed:
  • Yanhao Tang

    (Cornell University)

  • Kin Fai Mak

    (Cornell University
    Cornell University
    Kavli Institute at Cornell for Nanoscale Science)

  • Jie Shan

    (Cornell University
    Cornell University
    Kavli Institute at Cornell for Nanoscale Science)

Abstract

Single-layer transition metal dichalcogenides provide a promising material system to explore the electron’s valley degree of freedom as a quantum information carrier. The valley degree of freedom can be directly accessed by means of optical excitation. However, rapid valley relaxation of optically excited electron-hole pairs (excitons) through the exchange interaction has been a major roadblock. Theoretically such valley relaxation is suppressed in dark excitons, suggesting a potential route for long valley lifetimes. Here we develop a waveguide-based method to detect time-resolved and energy-resolved dark exciton emission in single-layer WSe2, which involves spin-forbidden optical transitions with an out-of-plane dipole moment. The valley degree of freedom of dark excitons is accessed through the valley-dependent Zeeman effect under an out-of-plane magnetic field. We find a short valley lifetime for the dark neutral exciton, likely due to the short-range electron-hole exchange, but long valley lifetimes exceeding several nanoseconds for the dark charged excitons.

Suggested Citation

  • Yanhao Tang & Kin Fai Mak & Jie Shan, 2019. "Long valley lifetime of dark excitons in single-layer WSe2," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12129-1
    DOI: 10.1038/s41467-019-12129-1
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    Cited by:

    1. Pablo Hernández López & Sebastian Heeg & Christoph Schattauer & Sviatoslav Kovalchuk & Abhijeet Kumar & Douglas J. Bock & Jan N. Kirchhof & Bianca Höfer & Kyrylo Greben & Denis Yagodkin & Lukas Linhar, 2022. "Strain control of hybridization between dark and localized excitons in a 2D semiconductor," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. 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.
    3. 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.
    4. Jiewei Chen & Yue Zhou & Jianmin Yan & Jidong Liu & Lin Xu & Jingli Wang & Tianqing Wan & Yuhui He & Wenjing Zhang & Yang Chai, 2022. "Room-temperature valley transistors for low-power neuromorphic computing," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    5. Xuezhi Ma & Kaushik Kudtarkar & Yixin Chen & Preston Cunha & Yuan Ma & Kenji Watanabe & Takashi Taniguchi & Xiaofeng Qian & M. Cynthia Hipwell & Zi Jing Wong & Shoufeng Lan, 2022. "Coherent momentum control of forbidden excitons," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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