观察非厄米合成晶格中的半整数拓扑圈数

IF 20.6 Q1 OPTICS
Mu Yang, Yu-Wei Liao, Hao-Qing Zhang, Yue Li, Zhi-He Hao, Zheng-Wei Zhou, Xi-Wang Luo, Jin-Shi Xu, Chuan-Feng Li, Guang-Can Guo
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引用次数: 0

摘要

非厄米体系揭示了在厄米体系中没有观察到的独特拓扑现象,如新的拓扑分类和NH趋肤效应。在周期NH系统中,本征能变得复杂,在复平面上表现出绕组,而本征态绕组数在厄米系统中是严格整数,可以取半整数值。然而,本征能和本征态的NH绕组,特别是半整数绕组的直接实验观测仍然是一个重大挑战。在这项工作中,我们利用轨道角动量(OAM)合成维度构建了一个NH拓扑晶格,并实现了本征态和本征能绕组的直接观测。本文首次对半整数本征态圈数进行了实验观察,揭示了NH蒙皮动力学方向与本征能圈数之间的内在关系。此外,通过将OAM链划分为两个半无限链,我们观察到了零边界模式,并证明了它们的分布是由本征态和本征能的圈数共同决定的。这项工作提供了对NH拓扑的全面见解,并为探索NH现象提供了一个新的实验平台。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Observing half-integer topological winding numbers in non-Hermitian synthetic lattices

Observing half-integer topological winding numbers in non-Hermitian synthetic lattices

Non-Hermitian (NH) systems have revealed unique topological phenomena that are not observed in Hermitian counterparts, such as novel topology classifications and the NH skin effect. In periodic NH systems, eigenenergies become complex and exhibit windings in the complex plane, while eigenstate winding numbers, which are strictly integers in Hermitian systems, can take half-integer values. However, direct experimental observation of NH winding of both eigenenergies and eigenstates, especially the half-integer winding, remains a significant challenge. In this work, we utilize the orbital angular momentum (OAM) synthetic dimension to construct an NH topological lattice and achieve direct observation of both eigenstate and eigenenergy windings. We report the first experimental observation of a half-integer eigenstate winding number, and reveal the intrinsic relationship between the direction in the NH skin dynamics and eigenenergy windings. Furthermore, by partitioning the OAM chain into two semi-infinite chains, we observe zero boundary modes and demonstrate that their distributions are jointly determined by the winding numbers of both the eigenstates and eigenenergies. This work provides comprehensive insights into NH topologies and offers a new experimental platform for exploring NH phenomena.

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来源期刊
Light-Science & Applications
Light-Science & Applications 数理科学, 物理学I, 光学, 凝聚态物性 II :电子结构、电学、磁学和光学性质, 无机非金属材料, 无机非金属类光电信息与功能材料, 工程与材料, 信息科学, 光学和光电子学, 光学和光电子材料, 非线性光学与量子光学
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803
审稿时长
2.1 months
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