Article Boosting the Emission of Momentum Indirect Interlayer Excitons by an Optical Near Field in Misaligned 2D Heterostructures

Qixing Wang ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Jurgen H. Smet

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Qixing Wang, Takashi Taniguchi, Kenji Watanabe, Jurgen H. Smet. Boosting the Emission of Momentum Indirect Interlayer Excitons by an Optical Near Field in Misaligned 2D Heterostructures. Nano Letters. 2025, 25 (41), 14800-14807. https://doi.org/10.1021/acs.nanolett.5c02703

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(abstract)

The Moiré superlattice potential in van der Waals heterostructures localizes the interlayer excitons and modifies the band structure so that their emission wavelength can be adjusted substantially. However, twisted structures suffer from a poor emission quantum yield and long radiative lifetimes due to the angle induced momentum mismatch. Moreover, the vertical orientation of the interlayer exciton dipole hampers the collection efficiency. Here, we demonstrate that these unfavorable conditions can be fully overcome by embedding the heterostructure in a plasmonic circular nanocavity. By adjusting the cavity radius, the emission enhancement factor for the interlayer excitons can exceed four orders of magnitude due to the synergistic effect of photon momentum enlargement and the promotion of the excitation rate, quantum yield and collection efficiency by the optical near field. This strategy for engineering light-matter interactions can turn these atomically thin heterostructures as alluring as their direct band gap opponents in the field of optoelectronics.

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Keyword: interlayer excitons
, plasmonic nanocavity, emission enhancement


Date published: 2025-10-15

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 25 issue. 41 p. 14800-14807

Funding:

  • Ministry of Education, Culture, Sports, Science and Technology
  • Deutsche Forschungsgemeinschaft SPP2244
  • Core Research for Evolutional Science and Technology JPMJCR24A5
  • Japan Society for the Promotion of Science 21H05233
  • Japan Society for the Promotion of Science 23H02052
  • Japan Science and Technology Agency
  • National Natural Science Foundation of China 62304186
  • Natural Science Foundation of Jiangxi Province 20252BAC200013
  • National Science Foundation of Jiujiang S2024KXJJ0001

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

MDR DOI:

First published URL: https://doi.org/10.1021/acs.nanolett.5c02703

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Updated at: 2026-02-16 16:30:58 +0900

Published on MDR: 2026-02-16 13:57:35 +0900

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