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Collective vibronic cascade in cavity-coupled Jahn-Teller active molecules

Suraj Kumar Pandit1,2,*, Abhinay Pandey2,3,*, Athreya Shankar2,3,†, and Krishna R. Nandipati1,2,‡

  • *These authors contributed equally to this work.
  • †Contact author: athreya@iitm.ac.in
  • ‡Contact author: knandipati@iitm.ac.in
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Phys. Rev. A 114, 012802 – Published 6 July, 2026

DOI: https://doi.org/10.1103/6wf6-kmtp

Abstract

We study the polaritonic states and dynamics of multiple Jahn-Teller (JT) active molecules coupled to the modes of a Fabry-Perot cavity. We find that collective effects dramatically alter the interplay of electronic, vibrational, and cavity angular momenta, giving rise to markedly different polaritonic spectra and dynamics even when going from one to two JT molecules. Starting from the ground vibronic state, we find that JT molecules collectively coupled to a common cavity can access a cascade of high-angular-momentum vibronic states in the presence of a single-cavity photon, in sharp contrast to the single molecule case where the range of accessible vibronic angular momentum values are bounded. The observable consequences are a broadening of the cavity-molecular polariton spectrum and a suppression of photon polarization dynamics under broadband excitation of the system. Our results uncover rich pathways for vibronic angular momentum transfer unique to collective molecular polaritonics with potential implications for cavity-assisted photophysics and photochemistry.

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Phys. Rev. A 114, 012802– Published 6 July, 2026
  • Received 21 November 2025
  • Accepted 29 May 2026
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