Article Excitonic Linewidth Approaching the Homogeneous Limit in MoS2-Based van der Waals Heterostructures

F. Cadiz ; E. Courtade ; C. Robert ; G. Wang ; Y. Shen ; H. Cai ; T. Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; K. Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; H. Carrere ; D. Lagarde ; M. Manca ; T. Amand ; P. Renucci ; S. Tongay ; X. Marie ; B. Urbaszek

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F. Cadiz, E. Courtade, C. Robert, G. Wang, Y. Shen, H. Cai, T. Taniguchi, K. Watanabe, H. Carrere, D. Lagarde, M. Manca, T. Amand, P. Renucci, S. Tongay, X. Marie, B. Urbaszek. Excitonic Linewidth Approaching the Homogeneous Limit in MoS2-Based van der Waals Heterostructures. Physical Review X. 2017, 7 (2), 021026. https://doi.org/10.1103/physrevx.7.021026
SAMURAI

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(abstract)

The strong light-matter interaction and the valley selective optical selection rules make monolayer (ML) MoS2 an exciting 2D material for fundamental physics and optoelectronics applications. But, so far, optical transition linewidths even at low temperature are typically as large as a few tens of meV and contain homogeneous and inhomogeneous contributions. This prevented in-depth studies, in contrast to the better- characterized ML materials MoSe2 and WSe2. In this work, we show that encapsulation of ML MoS2 in hexagonal boron nitride can efficiently suppress the inhomogeneous contribution to the exciton linewidth, as we measure in photoluminescence and reflectivity a FWHM down to 2 meV at T 1⁄4 4 K. Narrow optical transition linewidths are also observed in encapsulated WS2, WSe2, and MoSe2 MLs. This indicates that surface protection and substrate flatness are key ingredients for obtaining stable, high-quality samples. Among the new possibilities offered by the well-defined optical transitions, we measure the homogeneous broadening induced by the interaction with phonons in temperature-dependent experiments. We uncover new information on spin and valley physics and present the rotation of valley coherence in applied magnetic fields perpendicular to the ML.

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Keyword: Monolayer, molybdenum disulfide, optical properties

Date published: 2017-05-18

Publisher: American Physical Society (APS)

Journal:

  • Physical Review X (ISSN: 21603308) vol. 7 issue. 2 021026

Funding:

  • H2020 European Research Council 306719
  • Agence Nationale de la Recherche ANR-11-IDEX-0002-02
  • Agence Nationale de la Recherche ANR-10- LABX-0037-NEXT
  • Institut Universitaire de France
  • National Science Foundation DMR-1552220
  • National Science Foundation CMMI-1561839
  • Ministry of Education, Culture, Sports, Science and Technology
  • Japan Society for the Promotion of Science JP26248061
  • Japan Society for the Promotion of Science JP15K21722
  • Japan Society for the Promotion of Science JP25106006
  • Marie Sklodowska-Curie 676108

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1103/physrevx.7.021026

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Updated at: 2025-02-28 16:30:37 +0900

Published on MDR: 2025-02-28 16:30:37 +0900

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