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Negative-mass exciton polaritons induced by dissipative light-matter coupling in an atomically thin semiconductor

Author

Listed:
  • M. Wurdack

    (The Australian National University)

  • T. Yun

    (The Australian National University
    Monash University
    Songshan Lake Materials Laboratory
    Chinese Academy of Science)

  • M. Katzer

    (Technische Universität Berlin)

  • A. G. Truscott

    (The Australian National University)

  • A. Knorr

    (Technische Universität Berlin)

  • M. Selig

    (Technische Universität Berlin)

  • E. A. Ostrovskaya

    (The Australian National University)

  • E. Estrecho

    (The Australian National University)

Abstract

Dispersion engineering is a powerful and versatile tool that can vary the speed of light signals and induce negative-mass effects in the dynamics of particles and quasiparticles. Here, we show that dissipative coupling between bound electron-hole pairs (excitons) and photons in an optical microcavity can lead to the formation of exciton polaritons with an inverted dispersion of the lower polariton branch and hence, a negative mass. We perform direct measurements of the anomalous dispersion in atomically thin (monolayer) WS2 crystals embedded in planar microcavities and demonstrate that the propagation direction of the negative-mass polaritons is opposite to their momentum. Our study introduces the concept of non-Hermitian dispersion engineering for exciton polaritons and opens a pathway for realising new phases of quantum matter in a solid state.

Suggested Citation

  • M. Wurdack & T. Yun & M. Katzer & A. G. Truscott & A. Knorr & M. Selig & E. A. Ostrovskaya & E. Estrecho, 2023. "Negative-mass exciton polaritons induced by dissipative light-matter coupling in an atomically thin semiconductor," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36618-6
    DOI: 10.1038/s41467-023-36618-6
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    1. Yesenia A. García Jomaso & Brenda Vargas & David Ley Domínguez & Román J. Armenta-Rico & Huziel E. Sauceda & César L. Ordoñez-Romero & Hugo A. Lara-García & Arturo Camacho-Guardian & Giuseppe Pirrucci, 2024. "Intercavity polariton slows down dynamics in strongly coupled cavities," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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