Abstract
We propose a scheme to achieve the nonreciprocal amplification in a hybrid cavity magnonics system. Because of the destructive interference between different paths and the introduction of the pumping of the magnon, the nonreciprocal amplification can be observed. Owing to the gain and dissipation, with the varying of parameters, the eigenvalues of the effective Hamiltonian exhibit exceptional points (EPs). We investigate the relation between EPs and the nonreciprocal amplification transmission and find that EPs divide the parameters in different regions at which the behavior of amplification transmission is different; thus the EPs can help us understand the amplification transmission as well as find the optimized parameters.
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