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Issue 25, 2019
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Intrinsic lifetime of higher excitonic states in tungsten diselenide monolayers

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Abstract

The reduced dielectric screening in atomically thin transition metal dichalcogenides allows to study the hydrogen-like series of higher exciton states in optical spectra even at room temperature. The width of excitonic peaks provides information about the radiative decay and phonon-assisted scattering channels limiting the lifetime of these quasi-particles. While linewidth studies so far have been limited to the exciton ground state, encapsulation with hBN has recently enabled quantitative measurements of the broadening of excited exciton resonances. Here, we present a joint experiment-theory study combining microscopic calculations with spectroscopic measurements on the intrinsic linewidth and lifetime of higher exciton states in hBN-encapsulated WSe2 monolayers. Surprisingly, despite the increased number of scattering channels, we find both in theory and experiment that the linewidth of higher excitonic states is similar or even smaller compared to the ground state. Our microscopic calculations ascribe this behavior to a reduced exciton–phonon scattering efficiency for higher excitons due to spatially extended orbital functions.

Graphical abstract: Intrinsic lifetime of higher excitonic states in tungsten diselenide monolayers

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Publication details

The article was received on 17 May 2019, accepted on 10 Jun 2019 and first published on 19 Jun 2019


Article type: Paper
DOI: 10.1039/C9NR04211C
Nanoscale, 2019,11, 12381-12387
  • Open access: Creative Commons BY license
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    Intrinsic lifetime of higher excitonic states in tungsten diselenide monolayers

    S. Brem, J. Zipfel, M. Selig, A. Raja, L. Waldecker, J. D. Ziegler, T. Taniguchi, K. Watanabe, A. Chernikov and E. Malic, Nanoscale, 2019, 11, 12381
    DOI: 10.1039/C9NR04211C

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