标题： 非厄米拓扑位错态与位错皮层效应的观测 显示英文标题

标题： Observation of non-Hermitian dislocation bound states and dislocation skin effects

摘要： 非厄米（NH）拓扑与晶体缺陷的结合引起了广泛关注，但由于设计和测量方面的挑战，其实验探索受到限制。 在这里，我们展示了二维声学非厄米陈晶格中非厄米位错束缚态（NHDS）以及由位错引起的非厄米皮层效应的实验观测。 通过在这些声学晶格中嵌入边缘位错，并通过有源超原子实现精确控制的跳跃和现场增益/损耗，我们揭示了复杂能量谱线隙内位错核心处的鲁棒缺陷束缚态。 这些NHDS能够抵抗适度的非厄米扰动，但在系统到达布里渊区周期（开）边界条件下的非凡点时，会逐渐去局域化并与体（皮层）态合并。 此外，我们的实验表明，在周期系统中，当位错方向垂直于伯格斯矢量时，位错核心可以表现出弱的非厄米皮层效应。 我们的发现为通过晶格缺陷探测非厄米拓扑开辟了一条实验路径，并为缺陷工程拓扑器件开辟了新的途径。 显示英文摘要

摘要： The confluence of Non-Hermitian (NH) topology and crystal defects has culminated significant interest, yet its experimental exploration has been limited due to the challenges involved in design and measurements. Here, we showcase experimental observation of NH dislocation bound states (NHDS) and the dislocation-induced NH skin effect in two-dimensional acoustic NH Chern lattices. By embedding edge dislocations in such acoustic lattices and implementing precision-controlled hopping and onsite gain/loss via active meta-atoms, we reveal robust defect-bound states localized at dislocation cores within the line gap of the complex energy spectrum. These NHDS survive against moderate NH perturbations but gradually delocalize and merge with the bulk (skin) states as the system arrives at the shore of fostering exceptional points in the Brillouin zone under periodic (open) boundary conditions. Furthermore, our experiments demonstrate that the dislocation core can feature weak NH skin effects when its direction is perpendicular to the Burgers vector in periodic systems. Our findings pave an experimental pathway for probing NH topology via lattice defects and open new avenues for defect-engineered topological devices.