We reveal the cooperative effect of coherent and dissipative magnon-photon couplings in an open cavity magnonic system, which leads to nonreciprocity with a considerably large isolation ratio and flexible controllability. Furthermore, we discover unidirectional invisibility for microwave propagation, which appears at the zero-damping condition for hybrid magnon-photon modes. A simple model is developed to capture the generic physics of the interference between coherent and dissipative couplings, which accurately reproduces the observations over a broad range of parameters. This general scheme could inspire methods to achieve nonreciprocity in other systems.
@article{arxiv.1908.07907,
title = {Nonreciprocity and Unidirectional Invisibility in Cavity Magnonics},
author = {Yi-Pu Wang and J. W. Rao and Y. Yang and Peng-Chao Xu and Y. S. Gui and B. M. Yao and J. Q. You and C. -M. Hu},
journal= {arXiv preprint arXiv:1908.07907},
year = {2019}
}