Article Identification of Exciton Complexes in Charge-Tunable Janus WSeS Monolayers

Matthew S. G. Feuer ; Alejandro R.-P. Montblanch ; Mohammed Y. Sayyad ; Carola M. Purser ; Ying Qin ; Evgeny M. Alexeev ; Alisson R. Cadore ; Barbara L. T. Rosa ; James Kerfoot ; Elaheh Mostaani ; Radosław Kalȩba ; Pranvera Kolari ; Jan Kopaczek ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Andrea C. Ferrari ; Dhiren M. Kara ; Sefaattin Tongay ; Mete Atatüre

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Matthew S. G. Feuer, Alejandro R.-P. Montblanch, Mohammed Y. Sayyad, Carola M. Purser, Ying Qin, Evgeny M. Alexeev, Alisson R. Cadore, Barbara L. T. Rosa, James Kerfoot, Elaheh Mostaani, Radosław Kalȩba, Pranvera Kolari, Jan Kopaczek, Kenji Watanabe, Takashi Taniguchi, Andrea C. Ferrari, Dhiren M. Kara, Sefaattin Tongay, Mete Atatüre. Identification of Exciton Complexes in Charge-Tunable Janus WSeS Monolayers. ACS Nano. 2023, 17 (8), 7326-7334. https://doi.org/10.1021/acsnano.2c10697
SAMURAI

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(abstract)

Janus transition-metal dichalcogenide mono-layers are fully artificial materials, where one plane of chalcogen atoms is replaced by chalco- gen atoms of a different type. Theory pre- dicts an in-built out-of-plane electric field, giving rise to long-lived, dipolar excitons, while preserv- ing direct-bandgap optical transitions in a uni- form potential landscape. Previous Janus studies had broad photoluminescence (>15 meV) spectra obfuscating their excitonic origin. Here, we identify the neutral, and negatively charged inter- and intravalley exciton transitions in Janus WSe monolayer with ∼6 meV optical linewidths. We combine a recently developed synthesis technique , with the integration of Janus monolayers into vertical heterostructures, allowing doping control. Further, magneto-optic measurements indicate that monolayer WSe has a direct bandgap at the K points. This work provides the foundation for applications such as nanoscale sensing, which relies on resolving excitonic energy shifts, and photo-voltaic energy harvesting, which requires efficient creation of long-lived excitons and integra- tion into vertical heterostructures.

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Keyword: Janus transition-metal dichalcogenide monolayers, dipolar excitons, vertical heterostructures

Date published: 2023-04-25

Publisher: American Chemical Society (ACS)

Journal:

  • ACS Nano (ISSN: 1936086X) vol. 17 issue. 8 p. 7326-7334

Funding:

  • Engineering and Physical Sciences Research Council EP/K01711X/1
  • Engineering and Physical Sciences Research Council EP/K017144/1
  • Engineering and Physical Sciences Research Council EP/L016087/1
  • Engineering and Physical Sciences Research Council EP/N010345/1
  • Royal Society URF\R1\180593
  • European Commission
  • EU Quantum Technology
  • Japan Society for the Promotion of Science 19H05790
  • Japan Society for the Promotion of Science 20H00354
  • Japan Society for the Promotion of Science 21H05233
  • Graphene Flagship
  • H2020 European Research Council

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

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First published URL: https://doi.org/10.1021/acsnano.2c10697

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Updated at: 2025-02-14 12:31:04 +0900

Published on MDR: 2025-02-14 12:31:04 +0900

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