IDEAS home Printed from https://ideas.repec.org/a/nat/natcom/v10y2019i1d10.1038_s41467-019-12129-1.html
   My bibliography  Save this article

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
    as

    Download full text from publisher

    File URL: https://www.nature.com/articles/s41467-019-12129-1
    File Function: Abstract
    Download Restriction: no
    File URL: https://libkey.io/10.1038/s41467-019-12129-1?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    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. 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.
    3. 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.
    4. 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.
    5. 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.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12129-1. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.nature.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.