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Intrinsic lifetime of higher excitonic states in tungsten diselenide monolayers.
Brem, Samuel; Zipfel, Jonas; Selig, Malte; Raja, Archana; Waldecker, Lutz; Ziegler, Jonas D; Taniguchi, Takashi; Watanabe, Kenji; Chernikov, Alexey; Malic, Ermin.
Afiliación
  • Brem S; Chalmers University of Technology, Department of Physics, 41296 Gothenburg, Sweden. samuel.brem@chalmers.se.
  • Zipfel J; University of Regensburg, Department of Physics, 93053 Regensburg, Germany.
  • Selig M; Technical University Berlin, Institute of Theoretical Physics, 10623 Berlin, Germany.
  • Raja A; Kavli Energy NanoScience Institute, University of California Berkeley, Berkeley, USA.
  • Waldecker L; Stanford University, 348 Via Pueblo Mall, Stanford, California 94305, USA.
  • Ziegler JD; University of Regensburg, Department of Physics, 93053 Regensburg, Germany.
  • Taniguchi T; National Institute for Materials Science, Tsukuba, Ibaraki 305-004, Japan.
  • Watanabe K; National Institute for Materials Science, Tsukuba, Ibaraki 305-004, Japan.
  • Chernikov A; University of Regensburg, Department of Physics, 93053 Regensburg, Germany.
  • Malic E; Chalmers University of Technology, Department of Physics, 41296 Gothenburg, Sweden. samuel.brem@chalmers.se.
Nanoscale ; 11(25): 12381-12387, 2019 Jul 07.
Article en En | MEDLINE | ID: mdl-31215947
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.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nanoscale Año: 2019 Tipo del documento: Article País de afiliación: Suecia Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nanoscale Año: 2019 Tipo del documento: Article País de afiliación: Suecia Pais de publicación: Reino Unido