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Valley phonons and exciton complexes in a monolayer semiconductor

Author

Listed:
  • Minhao He

    (University of Washington)

  • Pasqual Rivera

    (University of Washington)

  • Dinh Tuan

    (University of Rochester)

  • Nathan P. Wilson

    (University of Washington)

  • Min Yang

    (University of Rochester)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Jiaqiang Yan

    (Oak Ridge National Laboratory
    University of Tennessee)

  • David G. Mandrus

    (Oak Ridge National Laboratory
    University of Tennessee
    University of Tennessee)

  • Hongyi Yu

    (University of Hong Kong)

  • Hanan Dery

    (University of Rochester
    University of Rochester)

  • Wang Yao

    (University of Hong Kong)

  • Xiaodong Xu

    (University of Washington
    University of Washington)

Abstract

The coupling between spin, charge, and lattice degrees of freedom plays an important role in a wide range of fundamental phenomena. Monolayer semiconducting transitional metal dichalcogenides have emerged as an outstanding platform for studying these coupling effects. Here, we report the observation of multiple valley phonons – phonons with momentum vectors pointing to the corners of the hexagonal Brillouin zone – and the resulting exciton complexes in the monolayer semiconductor WSe2. We find that these valley phonons lead to efficient intervalley scattering of quasi particles in both exciton formation and relaxation. This leads to a series of photoluminescence peaks as valley phonon replicas of dark trions. Using identified valley phonons, we also uncover an intervalley exciton near charge neutrality. Our work not only identifies a number of previously unknown 2D excitonic species, but also shows that monolayer WSe2 is a prime candidate for studying interactions between spin, pseudospin, and zone-edge phonons.

Suggested Citation

  • Minhao He & Pasqual Rivera & Dinh Tuan & Nathan P. Wilson & Min Yang & Takashi Taniguchi & Kenji Watanabe & Jiaqiang Yan & David G. Mandrus & Hongyi Yu & Hanan Dery & Wang Yao & Xiaodong Xu, 2020. "Valley phonons and exciton complexes in a monolayer semiconductor," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14472-0
    DOI: 10.1038/s41467-020-14472-0
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    Cited by:

    1. Juan Francisco Gonzalez Marin & Dmitrii Unuchek & Zhe Sun & Cheol Yeon Cheon & Fedele Tagarelli & Kenji Watanabe & Takashi Taniguchi & Andras Kis, 2022. "Room-temperature electrical control of polarization and emission angle in a cavity-integrated 2D pulsed LED," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. 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.
    3. 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.
    4. Erfu Liu & Jeremiah Baren & Zhengguang Lu & Takashi Taniguchi & Kenji Watanabe & Dmitry Smirnov & Yia-Chung Chang & Chun Hung Lui, 2021. "Exciton-polaron Rydberg states in monolayer MoSe2 and WSe2," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    5. Saroj B. Chand & John M. Woods & Jiamin Quan & Enrique Mejia & Takashi Taniguchi & Kenji Watanabe & Andrea Alù & Gabriele Grosso, 2023. "Interaction-driven transport of dark excitons in 2D semiconductors with phonon-mediated optical readout," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    6. Kai-Qiang Lin & Jonas D. Ziegler & Marina A. Semina & Javid V. Mamedov & Kenji Watanabe & Takashi Taniguchi & Sebastian Bange & Alexey Chernikov & Mikhail M. Glazov & John M. Lupton, 2022. "High-lying valley-polarized trions in 2D semiconductors," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    7. Soungmin Bae & Kana Matsumoto & Hannes Raebiger & Ken-ichi Shudo & Yong-Hoon Kim & Ørjan Sele Handegård & Tadaaki Nagao & Masahiro Kitajima & Yuji Sakai & Xiang Zhang & Robert Vajtai & Pulickel Ajayan, 2022. "K-point longitudinal acoustic phonons are responsible for ultrafast intervalley scattering in monolayer MoSe2," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    8. 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.
    9. 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.

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