Nonreciprocity and Unidirectional Invisibility in Cavity Magnonics

21 Aug 2019  ·  Wang Yi-Pu, Rao J. W., Yang Y., Xu Peng-Chao, Gui Y. S., Yao B. M., You J. Q., Hu C. -M. ·

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. read more

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Mesoscale and Nanoscale Physics Quantum Physics