Microwave amplification in a PT-symmetric-like cavity magnomechanical system

We propose a scheme that can generate tunable magnomechanically induced amplification in a double-cavity parity-time-(PT-) symmetric-like magnomechanical system under a strong control and weak probe field. The system consists of a ferromagnetic-material yttrium iron garnet (YIG) sphere placed in a passive microwave cavity which is connected with another active cavity. We reveal that ideally induced amplification of the microwave probe signal may reach the maximum value 106 when cavity-cavity, cavity-magnon and magnomechanical coupling strengths are nonzero simultaneously. Besides, we also find the phenomenon of slow-light propagation. In this case, group speed delay of the light can achieve 35 x 10(-5)s, which can enhance some nonlinear effect. Moreover, due to the relatively flat dispersion curve, the proposal may be applied to sensitive optical switches, which play an important role in storing photons and quantum optical chips.

Automated summary

This study proposes a scheme for generating amplification in a magnomechanical system, which can be tuned under strong control and weak probe field. The study also discovers the phenomenon of slow-light propagation and suggests potential applications in sensitive optical switches.