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arXiv · 2304.09627

Simultaneous nonreciprocal and ultra-strong coupling in cavity magnonics

Chi Zhang·Zhenhui Hao·Yongzhang Shi·Changjun Jiang·Xiling Li·C. K. Ong·Daqiang Gao·Guozhi Chai
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Abstract

We demonstrate the simultaneous realization of nonreciprocal coupling and ultra-strong coupling in cavity magnonics. By replacing a copper cylinder with a yttrium iron garnet cylinder within the photonic crystal, we achieve an ultra-strong coupling strength of 1.18 GHz and a coupling efficiency of 10.9%. Nonreciprocal microwave transmission emerges within the photonic bandgap, due to the breaking of time-reversal symmetry through the gyromagnetic and Faraday effects. This work establishes a foundation for advanced nonreciprocal devices in hybrid cavity magnonic systems, with promising applications in quantum information processing and microwave isolation.

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Chi Zhang, Zhenhui Hao, Yongzhang Shi, Changjun Jiang, Xiling Li, C. K. Ong, Daqiang Gao, Guozhi Chai. 2023-04-19. Simultaneous nonreciprocal and ultra-strong coupling in cavity magnonics. https://arxiv.org/abs/2304.09627

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