Multistability and Self-Trapping in Cavity-Magnonic Dimer

TL;DR

This paper demonstrates that driven-dissipative cavity-magnonic dimers exhibit multistability, self-trapping, and critical slowing down, with quantum correlations revealing phase boundaries, thus offering a platform for nonlinear nonequilibrium physics in hybrid quantum systems.

Contribution

It introduces the concept of multistability and self-trapping in cavity-magnonic dimers, highlighting quantum signatures near phase transitions, a novel insight in hybrid quantum nonlinear systems.

Findings

Multistability with symmetric and symmetry-broken states.

Magnon self-trapping causes persistent population imbalance.

Quantum fidelity and mutual information sharply increase near phase boundaries.

Abstract

We show that a driven-dissipative cavity-magnonic dimer supports multistability with coexisting symmetric and symmetry-broken steady states. The interplay between magnon Kerr nonlinearity and photon tunneling induces magnon self-trapping, leading to a persistent population imbalance between the two resonators. In the vicinity of saddle-node bifurcations, the system exhibits critical slowing down, with relaxation times far exceeding the intrinsic dissipation scale. Focusing on quan- tum correlations, we analyze the quantum fidelity and mutual information between the intercavity magnon modes. We find that both the infidelity and the mutual information increase sharply near the phase boundaries, providing clear quantum signatures of the multistable and symmetry-broken phases. Our results establish cavity magnonic dimers as a versatile platform for exploring nonlinear nonequilibrium physics in hybrid quantum systems.