阻尼作用下自旋光子耦合系统的拓扑性质
Topological Properties of a Coupled Spin-Photon System Induced by Damping
摘要：
实验研究了阻尼诱导的强耦合自旋光子系统的拓扑性质。自旋和光子损失的存在导致非厄米特系统具有由本征值谱的拓扑结构和例外点（EP）的存在所决定的各种奇异现象，其中耦合的自旋-光子本征向量合并。通过控制自旋共振频率和自旋-光子耦合强度，我们观察到一个共振交叉的协同性以上，这表明弱耦合和强耦合之间的边界应该是基于EP位置，而不是协同性。此外，我们观察到动态模式切换时，环绕EP和识别潜在的工程师的拓扑结构的耦合自旋光子系统与其他模式。因此，我们的工作进一步突出了阻尼在强耦合机制中的作用，并展示了自旋光子系统在非厄米物理研究中的潜力和巨大的灵活性。
英文摘要：
We experimentally examine the topological nature of a strongly coupled spin-photon system induced by damping. The presence of both spin and photonic losses results in a non-Hermitian system with a variety of exotic phenomena dictated by the topological structure of the eigenvalue spectra and the presence of an exceptional point (EP), where the coupled spin-photon eigenvectors coalesce. By controlling both the spin resonance frequency and the spin-photon coupling strength we observe a resonance crossing for cooperativities above one, suggesting that the boundary between weak and strong coupling should be based on the EP location rather than the cooperativity. Furthermore we observe dynamic mode switching when encircling the EP and identify the potential to engineer the topological structure of coupled spin-photon systems with additional modes. Our work therefore further highlights the role of damping within the strong coupling regime, and demonstrates the potential and great flexibility of spin-photon systems for studies of non-Hermitian physics.
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