Ultrastrong Coupling of Band-Nested Excitons in Few-Layer Molybdenum Disulphide

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The 2D transition-metal dichalcogenides (2D TMDCs) are an intriguing platform for studying strong light–matter interactions because they combine the electronic properties of conventional semiconductors with the optical resonances found in organic systems. However, the coupling strengths demonstrated in strong exciton–polariton coupling in the 2D TMDCs remain much lower than those found in organic systems. In this paper, a new approach is taken by utilizing the large oscillator strength of the above-band gap C exciton in few-layer molybdenum disulphide (FL-MoS2). A k-space Rabi splitting of 293 meV is shown when coupling FL-MoS2 C excitons to surface plasmon polaritons at room temperature. This value is 11% of the uncoupled exciton energy (2.67 eV or 464 nm), ≈2× what is typically seen in the TMDCs, placing the system in the ultrastrong coupling regime. The results take a step toward finally achieving the efficient quantum coherent processes of ultrastrong coupling in a CMOS-compatible system—the 2D TMDCs—in the visible spectrum.

Original languageAmerican English
Article number2200485
Number of pages8
JournalAdvanced Optical Materials
Issue number20
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2022 National Renewable Energy Laboratory. Advanced Optical Materials published by Wiley-VCH GmbH.

NREL Publication Number

  • NREL/JA-5900-82808


  • 2D materials
  • exciton–polaritons
  • MoS
  • strong coupling
  • surface plasmon polaritons
  • transition-metal dichalcogenides
  • ultrastrong coupling


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