Collective response in light-matter interactions: The interplay between strong coupling and local dynamics

Area of Science:

• Quantum Optics
• Molecular Dynamics
• Condensed Matter Physics

Background:

• Strong molecule-radiation field coupling is crucial for understanding collective optical responses in molecular ensembles within optical cavities.
• Electronic strong coupling involves timescale separation between electronic/photonic dynamics and nuclear motion.
• The interplay between collective coupling and local nuclear response raises questions about collective nuclear motion post-polariton formation.

Purpose of the Study:

• To investigate a model mimicking collective optical responses of molecular ensembles on vibronic dynamics.
• To explore whether collective optical excitation leads to collective nuclear motion, termed polaron decoupled dynamics.
• To analyze the dynamical properties of a simplified Holstein-Tavis-Cummings-type model.

Main Methods:

• Development and analysis of a simplified Holstein-Tavis-Cummings-type model.
• Replacement of boson modes with two-level systems to represent molecular vibrations.
• Investigation of short-time dynamics, continuous-wave (CW) driving response, and density of states spectrum following polariton excitation.

Main Results:

• The model exhibits dynamics that partially align with the polaron decoupling picture.
• Observed dynamics predominantly reflect the local nature of the electronic polariton's nuclear configuration.
• Evidence suggests that collective optical excitation does not predominantly lead to collective nuclear motion.

Conclusions:

• The study's findings indicate that the nuclear response in this model is primarily governed by local configurations rather than collective behavior.
• The investigated model provides insights into the complex interplay between light-matter interactions and molecular nuclear dynamics in confined systems.
• Further research may explore variations of the model to better capture collective nuclear phenomena.