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Wang, Yi-Pu; Rao, J. W.; Yang, Y.; Xu, Peng-Chao; Gui, Y. S.; Yao, B. M.; You, J. Q.; Hu, C.-M.
Physical review letters, 09/2019, Letnik: 123, Številka: 12Journal Article
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.
