Plasmon-Mediated Coherent Superposition of Discrete Excitons under Strong Exciton-Plasmon Coupling in Few-Layer MoS2 at Room Temperature

Aaron Rose, Jeremy Dunklin, Hanyu Zhang, Juan Merlo, Jao van de Lagemaat

Research output: Contribution to journalArticlepeer-review

15 Scopus Citations

Abstract

We demonstrate room temperature coherent hybridization of the A- and B-excitons in few-layer MoS2, mediated by simultaneous strong coupling to surface plasmon polaritons. Few-layer MoS2 was placed on a tunable plasmonic structure and the system's dispersion was measured by tuning the plasmon energy across the exciton energies. Strong coupling was observed as double Rabi splitting at the A- and B-excitons of 81 and 93 meV, respectively. A coupled harmonic oscillator model sheds light on the nature of the interaction, revealing a quantum superposition of the A- and B-excitons, mediated by the plasmon interaction. This observation suggests the possibility of room temperature intra- or intervalley quantum information transport and/or spin entanglement. The experiment confirms a previous theoretical prediction of room temperature exciton-exciton hybridization in two-dimensional MoS2. Further, through modeling we find that room temperature strong coupling is a general phenomenon among two-dimensional transition metal dichalcogenide exciton-plasmon systems.

Original languageAmerican English
Pages (from-to)1129-1134
Number of pages6
JournalACS Photonics
Volume7
Issue number5
DOIs
StatePublished - 20 May 2020

Bibliographical note

Publisher Copyright:
© 2020 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-74742

Keywords

  • exciton
  • MoS
  • strong coupling
  • surface plasmon polariton
  • transition metal dichalcogenide
  • two-dimensional system

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