Magnon-induced transparency and amplification in a hybrid cavity-magnon system

The magnon-induced transparency and magnon-induced slow light in a hybrid cavity-magnon system are analysed by using a set of experimentally realizable parameter. The cavity is driven by a strong microwave control field and a weaker probe field. The absorption and dispersion properties of the probe field are illustrated in detail. The transmission profile shows line shape structure. This line shape can be tuned via photon-magnon coupling rate, decay rate and applied magnetic field. The transmission profile also shows double-window magnon-induced transparency which supplies an additional degree of freedom of the present system. The phase of the transmitted field shows both anomalous and normal dispersion. The phase variation confirms that the group velocity shows both positive and negative values. The model system also shows slow light effect which can be controlled by applied magnetic field. This study may find applications in magnon-based quantum information processing and also the magnetic field-controlled low-power amplifier.