Dynamical phase-field model of cavity electromagnonic systems

TL;DR

This paper introduces a dynamical phase-field model for simulating coupled electromagnetic, magnetic, and mechanical dynamics in cavity electromagnonic systems, enabling the design and analysis of quantum transduction devices.

Contribution

The paper presents a novel 3D multiphase dynamical model that accurately simulates coupled photon-magnon-phonon interactions in cavity electromagnonic systems.

Findings

Demonstrates excitation of hybrid magnon-photon modes

Shows Floquet-induced magnonic Aulter-Townes splitting

Achieves triple phonon-magnon-photon resonance

Abstract

Cavity electromagnonic system, which simultaneously consists of cavities for photons, magnons (quanta of spin waves), and acoustic phonons, provides an exciting platform to achieve coherent energy transduction among different physical systems down to single quantum level. Here we report a dynamical phase-field model that allows simulating the coupled dynamics of the electromagnetic waves, magnetization, and strain in 3D multiphase systems. As examples of application, we computationally demonstrate the excitation of hybrid magnon-photon modes (magnon polaritons), Floquet-induced magnonic Aulter-Townes splitting, dynamical energy exchange (Rabi oscillation) and relative phase control (Ramsey interference) between the two magnon polariton modes. The simulation results are consistent with analytical calculations based on Floquet Hamiltonian theory. Simulations are also performed to design a cavity electro-magno-mechanical system that enables the triple phonon-magnon-photon resonance, where the resonant excitation of a chiral, fundamental (n=1) transverse acoustic phonon mode by magnon polaritons is demonstrated. With the capability to predict coupling strength, dissipation rates, and temporal evolution of photon/magnon/phonon mode profiles using fundamental materials parameters as the inputs, the present dynamical phase-field model represents a valuable computational tool to guide the fabrication of the cavity electromagnonic system and the design of operating conditions for applications in quantum sensing, transduction, and communication.