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Collective Rabi-Driven Vibrational Activation in Molecular Polaritons.

Carlos M Bustamante1, Franco P Bonafé1, Richard Richardson2

  • 1Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Luruper Chaussee 149, Hamburg 22761, Germany.

Nano Letters
|April 7, 2026
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Summary
This summary is machine-generated.

We discovered a new way molecular polaritons activate vibrations in driven optical cavities. Collective electronic strong coupling drives nuclear motion, offering new insights into light-matter interactions.

Keywords:
Ehrenfest dynamicsMaxwell’s equationsPolaritonic chemistryelectromagnetismoptical cavity

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Area of Science:

  • Quantum optics
  • Molecular dynamics
  • Cavity quantum electrodynamics

Background:

  • Molecular polaritons, formed by strong coupling of molecular states with confined electromagnetic fields, are well-studied.
  • The role of electron-nuclear dynamics in driven cavities remains largely unexplored.

Purpose of the Study:

  • Investigate the influence of electron-nuclear dynamics on molecular polaritons in driven optical cavities.
  • Uncover novel mechanisms of vibrational activation under collective electronic strong coupling (ESC).

Main Methods:

  • Self-consistent simulations combining Maxwell's equations and quantum molecular dynamics.
  • Modeling vibrational wave packet dynamics in a two-level system.
  • Atomistic simulations using time-dependent density-functional tight-binding theory.

Main Results:

  • Identified a mechanism where collective electronic Rabi oscillations coherently drive nuclear motion.
  • Vibrational activation shows non-monotonic dependence on Rabi frequency.
  • Activation is maximized when polaritonic splitting resonates with molecular vibrational modes.

Conclusions:

  • Collective ESC in driven cavities induces a novel vibrational activation mechanism.
  • The observed phenomenon resembles a stimulated Raman-like relaxation process.
  • Predictions are robust and experimentally verifiable under specific cavity conditions.