物理
引力奇点
奇点
叠加原理
量子力学
耗散系统
束缚态
奇偶性(物理)
经典力学
数学分析
数学
作者
Yidong Yang,Yipu Wang,J. W. Rao,Y. S. Gui,Bing Yao,Wei Lü,C.‐M. Hu
标识
DOI:10.1103/physrevlett.125.147202
摘要
By engineering an anti-parity-time (anti-PT) symmetric cavity magnonics system with precise eigenspace controllability, we observe two different singularities in the same system. One type of singularity, the exceptional point (EP), is produced by tuning the magnon damping. Between two EPs, the maximal coherent superposition of photon and magnon states is robustly sustained by the preserved anti-PT symmetry. The other type of singularity, arising from the dissipative coupling of two antiresonances, is an unconventional bound state in the continuum (BIC). At the settings of BICs, the coupled system exhibits infinite discontinuities in the group delay. We find that both singularities coexist at the equator of the Bloch sphere, which reveals a unique hybrid state that simultaneously exhibits the maximal coherent superposition and slow light capability.
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