非厄米陈绝缘体中的动力学转变
Dynamical transition in non-Hermitian Chern insulator
- Fudan University（复旦大学）
- Soochow University（苏州大学）
- Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究揭示非厄米陈绝缘体中波包传播的动力学转变由传统拓扑局域化与非厄米趋肤效应竞争决定，广义布里渊区框架无法预测此转变。
AI中文摘要：
我们揭示了非厄米陈绝缘体中波包传播的一种特殊动力学转变，其中边缘拓扑波包的演化并非仅由拓扑陈数决定。与厄米陈绝缘体不同，在厄米陈绝缘体中，从边缘起始的波包沿系统边界传播，而在这里，波包可能转而渗入体相。这种行为归因于传统拓扑诱导的局域化与非厄米趋肤效应之间的竞争。具体而言，当前者占主导时，波包将沿边界演化；否则，它将扩散到体相中。这些特征表明，虽然广义布里渊区框架能可靠地预测拓扑相变，但它本身并不能确定动力学转变。
英文摘要：
We unveil a peculiar dynamical transition for the propagation of wave packets in non-Hermitian Chern insulators, where the evolution of the topological wave packets at the edge is not solely determined by the topological Chern number. Unlike the Hermitian Chern insulator, where a wave packet initiated at the edge propagates along the system boundary, here it may instead penetrate into the bulk. This behavior is attributed to the competition between the localization induced by conventional topology and the non-Hermitian skin effect. Specifically, when the former dominant, the wave packet will evolve along the boundary; otherwise, it will spread into the bulk. These features demonstrate that while the generalized-Brillouin zone framework reliably predicts topological phase transitions, it does not on its own specify the dynamical transitions.
