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.
@article{arxiv.2603.23479,
title = {Intercavity phonons and dynamics in coupled polariton cavities},
author = {Iliana Carmona-Moreno and Grover Andrade-Sánchez and Hugo A Lara-García and Giuseppe Pirruccio and Arturo Camacho-Guardian},
journal= {arXiv preprint arXiv:2603.23479},
year = {2026}
}