Intercavity phonons and dynamics in coupled polariton cavities

TL;DR

This paper investigates the dynamics of intercavity polaritons in coupled cavities, revealing a new steady-state regime with phonon-like excitations and suppressed Rabi oscillations, advancing understanding of structured light-matter states.

Contribution

It introduces a novel dynamical regime in intercavity polaritons driven resonantly, showing the emergence of phonon-like Bogoliubov excitations with interactions inherited from excitons.

Findings

Suppressed Rabi oscillations in the new dynamical regime

Emergence of phonon-like Bogoliubov excitations

Interactions inherited from excitonic component

Abstract

Intercavity polaritons, hybrid quasiparticles with spatially separated photonic and excitonic components, provide a platform to engineer structured light-matter states. We show that resonant driving of the middle polariton branch leads to a qualitatively distinct dynamical regime in which coherent Rabi oscillations are suppressed, and the system evolves monotonically toward its steady state. Including interactions, we demonstrate that this regime supports Bogoliubov excitations with a phonon-like dispersion at low momenta. These collective modes inherit interactions from the excitonic fraction, while preserving the intrinsically intercavity nature of the quasiparticles.