2025/11/03 by Yujie Zhu, Jiaxuan Wu, Zhu, Yujie +22 · 1 citation
Physics and Astronomy · Engineering · #Mechanical and Optical Resonators #Ultrasonics and Acoustic Wave Propagation #Topological Materials and Phenomena
paper · pdf · doi:10.1103/q9np-lk7y
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 gc reaches over 10% of the resonant frequency ω0. We also predict an in-situ bistable electric-field 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., gc/ω0>1) near the ferroelectric-to-paraelectric phase transition. Our findings establish the theoretical basis for exploiting coherent ferron as a new contender for hybrid quantum system with strong and highly tunable coherent coupling