IDEAS home Printed from https://ideas.repec.org/a/nat/natcom/v9y2018i1d10.1038_s41467-018-04988-x.html
   My bibliography  Save this article

Evidence for line width and carrier screening effects on excitonic valley relaxation in 2D semiconductors

Author

Listed:
  • Yuhei Miyauchi

    (Kyoto University
    Nagoya University)

  • Satoru Konabe

    (Tokyo University of Science
    Hosei University)

  • Feijiu Wang

    (Kyoto University
    Nagoya University)

  • Wenjin Zhang

    (Kyoto University)

  • Alexander Hwang

    (Rice University
    Rice University)

  • Yusuke Hasegawa

    (Kyoto University)

  • Lizhong Zhou

    (Kyoto University)

  • Shinichiro Mouri

    (Kyoto University
    Ritsumeikan University)

  • Minglin Toh

    (National University of Singapore)

  • Goki Eda

    (National University of Singapore
    National University of Singapore
    National University of Singapore)

  • Kazunari Matsuda

    (Kyoto University)

Abstract

Monolayers of transition metal dichalcogenides (TMDC) have recently emerged as excellent platforms for exploiting new physics and applications relying on electronic valley degrees of freedom in two-dimensional (2D) systems. Here, we demonstrate that Coulomb screening by 2D carriers plays a critical role in excitonic valley pseudospin relaxation processes in naturally carrier-doped WSe2 monolayers (1L-WSe2). The exciton valley relaxation times were examined using polarization- and time-resolved photoluminescence spectroscopy at temperatures ranging from 10 to 160 K. We show that the temperature-dependent exciton valley relaxation times in 1L-WSe2 under various exciton and carrier densities can be understood using a unified framework of intervalley exciton scattering via momentum-dependent long-range electron–hole exchange interactions screened by 2D carriers that depend on the carrier density and the exciton linewidth. Moreover, the developed framework was successfully applied to engineer the valley polarization of excitons in 1L-WSe2. These findings may facilitate the development of TMDC-based opto-valleytronic devices.

Suggested Citation

  • Yuhei Miyauchi & Satoru Konabe & Feijiu Wang & Wenjin Zhang & Alexander Hwang & Yusuke Hasegawa & Lizhong Zhou & Shinichiro Mouri & Minglin Toh & Goki Eda & Kazunari Matsuda, 2018. "Evidence for line width and carrier screening effects on excitonic valley relaxation in 2D semiconductors," Nature Communications, Nature, vol. 9(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04988-x
    DOI: 10.1038/s41467-018-04988-x
    as

    Download full text from publisher

    File URL: https://www.nature.com/articles/s41467-018-04988-x
    File Function: Abstract
    Download Restriction: no
    File URL: https://libkey.io/10.1038/s41467-018-04988-x?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. Hongzhi Zhou & Qingjie Feng & Cheng Sun & Yahui Li & Weijian Tao & Wei Tang & Linjun Li & Enzheng Shi & Guangjun Nan & Haiming Zhu, 2024. "Robust excitonic light emission in 2D tin halide perovskites by weak excited state polaronic effect," Nature Communications, Nature, vol. 15(1), pages 1-11, 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:9:y:2018:i:1:d:10.1038_s41467-018-04988-x. 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.