Tunable-induced transparency and fast–slow light from atomic ensemble and a yttrium-iron-garnet sphere coupled to microwave cavities

Abstract

We theoretically investigate a hybrid cavity magnomechanical system with an atomic ensemble. The atomic ensemble is placed in the intersection of two microwave cavities, and a YIG sphere is located at a microwave cavity driven by a weak probe field. The results show that the phenomena of transparency, absorption and amplification windows can be achieved by adjusting the optomechanical interaction between the cavity and atomic ensemble. The microwave photon–atom coupling strength is found to be linearly correlated with the distance of the absorption peaks through measurement. We also found that better transparency can be gained by properly reducing the decay rate of the cavity and atomic ensemble. Further, we explore the group delay of the output field and find that the system enables fast and slow light conversion. Finally, we discover that atomic ensembles contribute to the modulation of the fast and slow light effects and frequency positions. This scheme has potential value in quantum information storage and high-precision measurements.