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Femtosecond exciton dynamics in WSe2 optical waveguides

Author

Listed:
  • Aaron J. Sternbach

    (Columbia University)

  • Simone Latini

    (Max Planck Institute for the Structure and Dynamics of Matter)

  • Sanghoon Chae

    (Columbia University)

  • Hannes Hübener

    (Max Planck Institute for the Structure and Dynamics of Matter)

  • Umberto Giovannini

    (Max Planck Institute for the Structure and Dynamics of Matter)

  • Yinming Shao

    (Columbia University)

  • Lin Xiong

    (Columbia University)

  • Zhiyuan Sun

    (Columbia University)

  • Norman Shi

    (Columbia University)

  • Peter Kissin

    (University of California, San Diego)

  • Guang-Xin Ni

    (Columbia University)

  • Daniel Rhodes

    (Columbia University)

  • Brian Kim

    (Columbia University)

  • Nanfang Yu

    (Columbia University)

  • Andrew J. Millis

    (Columbia University)

  • Michael M. Fogler

    (University of California, San Diego)

  • Peter J. Schuck

    (Columbia University)

  • Michal Lipson

    (Columbia University)

  • X.-Y. Zhu

    (Columbia University)

  • James Hone

    (Columbia University)

  • Richard D. Averitt

    (University of California, San Diego)

  • Angel Rubio

    (Max Planck Institute for the Structure and Dynamics of Matter
    Center for Computational Quantum Physics (CCQ), Flatiron Institute)

  • D. N. Basov

    (Columbia University)

Abstract

Van-der Waals (vdW) atomically layered crystals can act as optical waveguides over a broad range of the electromagnetic spectrum ranging from Terahertz to visible. Unlike common Si-based waveguides, vdW semiconductors host strong excitonic resonances that may be controlled using non-thermal stimuli including electrostatic gating and photoexcitation. Here, we utilize waveguide modes to examine photo-induced changes of excitons in the prototypical vdW semiconductor, WSe2, prompted by femtosecond light pulses. Using time-resolved scanning near-field optical microscopy we visualize the electric field profiles of waveguide modes in real space and time and extract the temporal evolution of the optical constants following femtosecond photoexcitation. By monitoring the phase velocity of the waveguide modes, we detect incoherent A-exciton bleaching along with a coherent optical Stark shift in WSe2.

Suggested Citation

  • Aaron J. Sternbach & Simone Latini & Sanghoon Chae & Hannes Hübener & Umberto Giovannini & Yinming Shao & Lin Xiong & Zhiyuan Sun & Norman Shi & Peter Kissin & Guang-Xin Ni & Daniel Rhodes & Brian Kim, 2020. "Femtosecond exciton dynamics in WSe2 optical waveguides," Nature Communications, Nature, vol. 11(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17335-w
    DOI: 10.1038/s41467-020-17335-w
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    References listed on IDEAS

    as
    1. Martin Claassen & Chunjing Jia & Brian Moritz & Thomas P. Devereaux, 2016. "All-optical materials design of chiral edge modes in transition-metal dichalcogenides," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
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    Cited by:

    1. Francesco L. Ruta & Shuai Zhang & Yinming Shao & Samuel L. Moore & Swagata Acharya & Zhiyuan Sun & Siyuan Qiu & Johannes Geurs & Brian S. Y. Kim & Matthew Fu & Daniel G. Chica & Dimitar Pashov & Xiaod, 2023. "Hyperbolic exciton polaritons in a van der Waals magnet," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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