Theory of Magnon Purcell Effect in Cavity Magnonic System

TL;DR

This paper analyzes how cavity effects influence magnon decay dynamics, establishing conditions for strong and weak coupling regimes, and predicts photon decay, with implications for quantum control and device development.

Contribution

It provides a systematic theoretical framework for understanding cavity-induced magnon decay and predicts photon decay, aligning with experimental data.

Findings

Analytical conditions for strong and weak coupling regimes.

Prediction of photon mode decay in cavity-magnonic systems.

Agreement with existing experimental observations.

Abstract

We conduct a systematic analysis of cavity effects on the decay dynamics of an open magnonic system. The Purcell effect on the magnon oscillator decay is thoroughly examined for both driven and non-driven scenarios. Analytical conditions are determined to distinguish between strong and weak coupling regimes, corresponding to oscillatory and pure decay behaviors respectively. Additionally, our theory also predicts the decay of the photon mode within the cavity-magnonic open system, demonstrating excellent agreement with existing experimental data. Our findings and methodologies can provide valuable insights for advancing research in cavity magnonic quantum control, quantum information processing, and the development of magnonic quantum devices.