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Nonexponential Photoluminescence Dynamics in an Inhomogeneous Ensemble of Excitons in WSe2 Monolayers

  • Optics and Laser Physics
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Abstract

The spectral and spatiotemporal dynamics of photoluminescence in monolayers of transition metal dichalcogenide WSe2 obtained by mechanical exfoliation on a Si/SiO2 substrate is studied over a wide range of temperatures and excitation powers. It is shown that the dynamics is nonexponential and, for times t exceeding ∼50 ps after the excitation pulse, is described by a dependence of the form 1/(t + t0). Photoluminescence decay is accelerated with a decrease in the temperature and in the energy of emitting states. It is shown that the observed dynamics cannot be described by a bimolecular recombination process, such as exciton—exciton annihilation. A model that describes the nonexponential photoluminescence dynamics by taking into account the spread of radiative recombination times of localized exciton states in a random potential gives good agreement with experimental data.

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Acknowledgments

We are grateful to S.N. Nikolaev for providing WSe2 crystals and to M.M. Glazov and M.L. Skorikov for fruitful discussions and valuable advice. Substrate preparation, flake transfer, and localization of monolayer samples were carried out at the Shared Facility Center of the Lebedev Physical Institute.

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Authors and Affiliations

  1. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia

    M. A. Akmaev, M. V. Kochiev, A. I. Duleba, M. V. Pugachev, A. Yu. Kuntsevich & V. V. Belykh

  2. Moscow Institute of Physics and Technology, National Research University, Dolgoprudnyi, Moscow region, 141701, Russia

    A. I. Duleba & M. V. Pugachev

Authors
  1. M. A. Akmaev
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  2. M. V. Kochiev
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  3. A. I. Duleba
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  4. M. V. Pugachev
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  5. A. Yu. Kuntsevich
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  6. V. V. Belykh
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Corresponding authors

Correspondence to M. A. Akmaev or V. V. Belykh.

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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 10, pp. 650–657.

Funding

This study was supported by the Russian Foundation for Basic Research (project no. 18-32-20202).

Translated by M. Skorikov

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Akmaev, M.A., Kochiev, M.V., Duleba, A.I. et al. Nonexponential Photoluminescence Dynamics in an Inhomogeneous Ensemble of Excitons in WSe2 Monolayers. Jetp Lett. 112, 607–614 (2020). https://doi.org/10.1134/S0021364020220063

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  • DOI: https://doi.org/10.1134/S0021364020220063

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