Article Nature of Long-Lived Moiré Interlayer Excitons in Electrically Tunable MoS2/MoSe2 Heterobilayers

Evgeny M. Alexeev ; Carola M. Purser ; Carmem M. Gilardoni ; James Kerfoot ; Hao Chen ; Alisson R. Cadore ; Bárbara L.T. Rosa ; Matthew S. G. Feuer ; Evans Javary ; Patrick Hays ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Seth Ariel Tongay ; Dhiren M. Kara ; Mete Atatüre ; Andrea C. Ferrari

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Evgeny M. Alexeev, Carola M. Purser, Carmem M. Gilardoni, James Kerfoot, Hao Chen, Alisson R. Cadore, Bárbara L.T. Rosa, Matthew S. G. Feuer, Evans Javary, Patrick Hays, Kenji Watanabe, Takashi Taniguchi, Seth Ariel Tongay, Dhiren M. Kara, Mete Atatüre, Andrea C. Ferrari. Nature of Long-Lived Moiré Interlayer Excitons in Electrically Tunable MoS2/MoSe2 Heterobilayers. Nano Letters. 2024, 24 (36), 11232-11238. https://doi.org/10.1021/acs.nanolett.4c02635

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(abstract)

Interlayer excitons in transition-metal dichalcogenide heterobilayers combine high binding energy and valley-contrasting physics with long optical lifetime and strong dipolar character. Their permanent electric dipole enables electric-field control of emis- sion energy, lifetime, and spatial localization. Material combination and device ge- ometry has direct impact on the nature of the interlayer excitons via their real- and momentum-space configuration. Here, we show that interlayer excitons in MoS2/MoSe2 heterobilayers are formed by charge carriers residing at the edges of the Brillouin zone, with negligible degree of interlayer hybridization. We find that the presence of the moiré superlattice leads to the reversal of the valley-dependent optical selection rules, yielding a positively valued g-factor and cross-polarized photoluminescence. Time- resolved photoluminescence measurements reveal that the interlayer exciton population retains the optically induced valley polarization throughout its microsecond-long life- time. The combination of long optical lifetime and valley polarization retention makes MoS2/MoSe2 heterobilayers a promising platform for studying fundamental bosonic interactions and developing excitonic circuits for optical information processing.

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Keyword: interlayer excitons
, MoS2/MoSe2
, moiré superlattice


Date published: 2024-09-11

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 24 issue. 36 p. 11232-11238

Funding:

  • European Commission
  • Ministry of Education, Culture, Sports, Science and Technology
  • Japan Society for the Promotion of Science 21H05233
  • 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
  • European Research Council
  • HORIZON EUROPE European Innovation Council
  • Japan Society for the Promotion of Science 23H02052
  • FP7 Ideas: European Research Council 319277
  • H2020 European Research Council 842251
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek 019.221EN.004

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

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First published URL: https://doi.org/10.1021/acs.nanolett.4c02635

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Updated at: 2026-02-11 08:30:15 +0900

Published on MDR: 2026-02-10 18:03:08 +0900

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