Strong Light-Matter Interactions between Gap Plasmons and Two-Dimensional Excitons under Ambient Conditions in a Deterministic Way

Longlong Yang, Xin Xie, Jingnan Yang, Mengfei Xue, Shiyao Wu, Shan Xiao, Feilong Song, Jianchen Dang, Sibai Sun, Zhanchun Zuo, Jianing Chen*, Yuan Huang*, Xingjiang Zhou, Kuijuan Jin, Can Wang*, Xiulai Xu*

*Corresponding author for this work

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Abstract

Strong exciton-plasmon interactions between layered two-dimensional (2D) semiconductors and gap plasmons show a great potential to implement cavity quantum electrodynamics under ambient conditions. However, achieving a robust plasmon-exciton coupling with nanocavities is still very challenging, because the layer area is usually small in the conventional approaches. Here, we report on a robust strong exciton-plasmon coupling between the gap mode of a bowtie and the excitons in MoS2layers with gold-Assisted mechanical exfoliation and nondestructive wet transfer techniques for a large-Area layer. Due to the ultrasmall mode volume and strong in-plane field, the estimated effective exciton number contributing to the coupling is largely reduced. With a corrected exciton transition dipole moment, the exciton numbers are extracted as being 40 for the case of a single layer and 48 for eight layers. Our work paves the way to realize strong coupling with 2D materials with a small number of excitons at room temperature.

Original languageEnglish
Pages (from-to)2177-2186
Number of pages10
JournalNano Letters
Volume22
Issue number6
DOIs
Publication statusPublished - 23 Mar 2022
Externally publishedYes

Keywords

  • effective exciton number
  • exciton
  • gap plasmon
  • strong coupling
  • transition-metal dichalcogenides

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Yang, L., Xie, X., Yang, J., Xue, M., Wu, S., Xiao, S., Song, F., Dang, J., Sun, S., Zuo, Z., Chen, J., Huang, Y., Zhou, X., Jin, K., Wang, C., & Xu, X. (2022). Strong Light-Matter Interactions between Gap Plasmons and Two-Dimensional Excitons under Ambient Conditions in a Deterministic Way. Nano Letters, 22(6), 2177-2186. https://doi.org/10.1021/acs.nanolett.1c03282