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Diffusion of Excitons in a Two-Dimensional Fermi Sea of Free Charges

  • Koloman Wagner
    Koloman Wagner
    Institute of Applied Physics and Wüzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany
    Department of Physics, University of Regensburg, 93053 Regensburg, Germany
  • Zakhar A. Iakovlev
    Zakhar A. Iakovlev
    Ioffe Institute, 194021 Saint Petersburg, Russian Federation
  • Jonas D. Ziegler
    Jonas D. Ziegler
    Institute of Applied Physics and Wüzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany
    Department of Physics, University of Regensburg, 93053 Regensburg, Germany
  • Marzia Cuccu
    Marzia Cuccu
    Institute of Applied Physics and Wüzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany
    More by Marzia Cuccu
  • Takashi Taniguchi
    Takashi Taniguchi
    International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki 305-004, Japan
  • Kenji Watanabe
    Kenji Watanabe
    Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-004, Japan
  • Mikhail M. Glazov
    Mikhail M. Glazov
    Ioffe Institute, 194021 Saint Petersburg, Russian Federation
  • , and 
  • Alexey Chernikov*
    Alexey Chernikov
    Institute of Applied Physics and Wüzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany
    Department of Physics, University of Regensburg, 93053 Regensburg, Germany
    *Email: [email protected]
Cite this: Nano Lett. 2023, 23, 11, 4708–4715
Publication Date (Web):May 23, 2023
https://doi.org/10.1021/acs.nanolett.2c03796
Copyright © 2023 American Chemical Society

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    Abstract

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    Propagation of light-emitting quasiparticles is of central importance across the fields of condensed matter physics and nanomaterials science. We experimentally demonstrate diffusion of excitons in the presence of a continuously tunable Fermi sea of free charge carriers in a monolayer semiconductor. Light emission from tightly bound exciton states in electrically gated WSe2 monolayer is detected using spatially and temporally resolved microscopy. The measurements reveal a nonmonotonic dependence of the exciton diffusion coefficient on the charge carrier density in both electron and hole doped regimes. Supported by analytical theory describing exciton–carrier interactions in a dissipative system, we identify distinct regimes of elastic scattering and quasiparticle formation determining exciton diffusion. The crossover region exhibits a highly unusual behavior of an increasing diffusion coefficient with increasing carrier densities. Temperature-dependent diffusion measurements further reveal characteristic signatures of freely propagating excitonic complexes dressed by free charges with effective mobilities up to 3 × 103 cm2/(V s).

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.nanolett.2c03796.

    • Sample fabrication, experimental setup, estimation of free charge carrier density, reproducibility, excitation density dependence, temporal filtering of dark exciton luminescence, extraction of scattering rates from line width broadening as well as more details on modeling composite exciton–trion diffusion and a detailed derivation of the theory describing exciton–electron scattering (PDF)

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    Cited By

    This article is cited by 1 publications.

    1. Thomas Sayer, Yusef R. Farah, Rachelle Austin, Justin Sambur, Amber T. Krummel, Andrés Montoya-Castillo. Trion Formation Resolves Observed Peak Shifts in the Optical Spectra of Transition-Metal Dichalcogenides. Nano Letters 2023, 23 (13) , 6035-6041. https://doi.org/10.1021/acs.nanolett.3c01342

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