Strong coupling between coherent ferrons and cavity acoustic phonons
Abstract
Coherent ferrons, the quanta of polarization waves, can potentially be hybridized with many other quasiparticles for achieving novel control modalities in quantum communication, computing, and sensing. Here, we theoretically demonstrate a new hybridized state resulting from the strong coupling between fundamental-mode (wavenumber is zero) coherent ferrons and cavity bulk acoustic phonons. Using a van der Waals ferroelectric CuInP2S6 membrane as an example, we predict an ultra-strong ferron-phonon coupling at room temperature, where the coupling strength g_c reaches over 10% of the resonant frequency {\omega}_0. We also predict an in-situ electric-field-driven bistable control of mode-specific ferron-phonon hybridization via ferroelectric switching. We further show that, CuInP2S6 allows for reaching the fundamentally intriguing but challenging deep strong coupling regime (i.e., g_c/{\omega}_0>1) near the ferroelectric-to-paraelectric phase transition. Our findings establish the theoretical basis for exploiting coherent ferrons as a new contender for hybrid quantum system with strong and highly tunable coherent coupling.
Cite
@article{arxiv.2511.01201,
title = {Strong coupling between coherent ferrons and cavity acoustic phonons},
author = {Yujie Zhu and Jiaxuan Wu and Anna N. Morozovska and Eugene A. Eliseev and Yulian M. Vysochanskii and Venkatraman Gopalan and Long-Qing Chen and Xufeng Zhang and Wei Zhang and Jia-Mian Hu},
journal= {arXiv preprint arXiv:2511.01201},
year = {2025}
}