Observation of emergent momentum-time skyrmions in parity-time-symmetric non-unitary quench dynamics
Observation of emergent momentum-time skyrmions in parity-time-symmetric non-unitary quench dynamics
复制标题
宇称时间对称非酉淬灭动力学中涌现动量时间斯格明子的观察
DOI：
10.1038/s41467-019-10252-7
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发表时间：
2019
影响因子：
16.6
通讯作者：
Xue Peng
中科院分区：
文献类型：
--
作者：
Wang Kunkun;Qiu Xingze;Xiao Lei;Zhan Xiang;Bian Zhihao;S;ers Barry C.;Yi Wei;Xue Peng
失超动力学中的拓扑引起了有趣的动力学拓扑现象，这些现象与静态哈密顿的拓扑密切相关，但在实验上却很难探索。在这里，我们从理论上描述和实验上检测的宇称时间对称的非幺正淬火动力学在单光子离散时间量子行走动量时间skyrmions。紧急skyrmion结构的保护，由动态陈数定义的紧急二维动量-时间子流形，并揭示了通过我们的实验方案，使时间相关的非厄米密度矩阵的建设，通过直接测量位置空间。我们的工作实验揭示了对称性和猝灭动力学在诱导涌现拓扑结构中的相互作用，并突出了离散时间量子行走在动态拓扑现象研究中的应用。
Topology in quench dynamics gives rise to intriguing dynamic topological phenomena, which are intimately connected to the topology of static Hamiltonians yet challenging to probe experimentally. Here we theoretically characterize and experimentally detect momentum-time skyrmions in parity-time-symmetric non-unitary quench dynamics in single-photon discrete-time quantum walks. The emergent skyrmion structures are protected by dynamic Chern numbers defined for the emergent two-dimensional momentum-time submanifolds, and are revealed through our experimental scheme enabling the construction of time-dependent non-Hermitian density matrices via direct measurements in position space. Our work experimentally reveals the interplay ofsymmetry and quench dynamics in inducing emergent topological structures, and highlights the application of discrete-time quantum walks for the study of dynamic topological phenomena.