发表机构
Eastern Institute of Technology; Institute for Advanced Study in Physics and School of Physics, Zhejiang University（宁波东方理工学院; 浙江大学物理学院与高等研究院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文研究腔介导自旋链，发现一类拓扑上不同的新型超辐射临界性，其临界线具有独特的边缘简并性，且该临界性具有普适性，在Zₙ簇量子位链中也存在。
AI 中文摘要
超辐射相变是光-物质耦合系统中的基础现象。本文揭示了一类新型超辐射临界性，其在拓扑上与已知的超辐射跃迁不同。以腔介导的伊自旋簇链为例，数值研究表明，分隔超辐射相与腔拓扑相的临界线具有鲁棒的对称性保护的边缘简并性，这是常规超辐射跃迁所不具备的特征。值得注意的是，尽管其局域体临界性质与此前发现的拓扑平凡超辐射跃迁无法区分，但两种临界性若不破坏保护对称性或经过多临界点则无法平滑连接。进一步研究表明，这种拓扑超辐射临界性具有普适性，也存在于腔介导的Zₙ簇量子位链中，互补的晶格模拟结果支持了这一结论。
英文摘要
Superradiant phase transitions are fundamental phenomena in light-matter coupled systems. Here, we uncover a novel class of superradiant criticality that is topologically distinct from previously known superradiant transitions. Using cavity-mediated cluster-Ising chains as an illustrative example, we numerically demonstrate that the critical line separating the superradiant phase from the cavity topological phase hosts robust symmetry-protected edge degeneracies, a feature absent in conventional superradiant transitions. Remarkably, although its local bulk critical properties are indistinguishable from those of the previously identified topologically trivial superradiant transition, the two criticalities cannot be smoothly connected without breaking the protecting symmetries or passing through a multicritical point. We further show that such topological superradiant criticality is generic, also occurring in cavity-mediated $\mathbb{Z}_{n}^{}$ cluster-qudit chains, as supported by complementary lattice simulations.
Comments16 pages, 9 figures. Any comments or suggestions are welcome!
