Single-mode magnon-polariton lasing and amplification controlled by dissipative coupling

TL;DR

This paper demonstrates how dissipative coupling in a cavity magnonic system enables single-mode magnon-polariton lasing and amplification, revealing new control mechanisms for light-matter interactions with implications for quantum technologies.

Contribution

It introduces a novel approach to control magnon-polariton lasing and amplification using dissipative coupling, highlighting its role in phase transitions and system coherence.

Findings

Achieved single-mode magnon-polariton lasing via dissipative coupling.

Identified the lasing threshold at a system cooperativity of unity.

Demonstrated magnon polariton amplification in the strong dissipative coupling regime.

Abstract

We demonstrate single-mode lasing of magnon polaritons in a cavity magnonic system enabled by dissipative coupling between two passive modes, microwave cavity mode and magnon mode in a ferrimagnetic spin ensemble. The cavity mode is partially compensated through a feedback circuit, which reduces its linewidth but retains its dissipative nature. By tuning the compensation strength and dissipative coupling strength, we reach a system cooperativity of unity, marking the lasing threshold and the formation of a zero-linewidth polariton mode. This mode also corresponds to a perfect Friedrich-Wintgen bound state in the continuum. Further increase of the cooperativity drives the system into the strong dissipative coupling regime, where magnon polariton amplification arises between two real frequency scattering poles. These results reveal that dissipative coupling cooperativity carries a clear physical meaning and serves as a key parameter for controlling phase transitions. Dissipative coupling offers an alternative paradigm for tailoring light matter interactions, paving the way for advances in both information processing and quantum technologies.