Details

Autor(en) / Beteiligte

• Wang, Kunkun
• Qiu, Xingze
• Xiao, Lei
• Zhan, Xiang
• Bian, Zhihao
• Sanders, Barry C
• Yi, Wei
• Xue, Peng

Titel

Observation of emergent momentum-time skyrmions in parity-time-symmetric non-unitary quench dynamics

Ist Teil von

• Nature communications, 2019-05, Vol.10 (1), p.2293-2293, Article 2293

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 [Formula: see text]-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 of [Formula: see text] symmetry and quench dynamics in inducing emergent topological structures, and highlights the application of discrete-time quantum walks for the study of dynamic topological phenomena.