globalchange  > 气候变化与战略
DOI: 10.1016/j.scib.2021.07.025
论文题名:
Observation of topological phase with critical localization in a quasi-periodic lattice
作者: Xiao T.; Xie D.; Dong Z.; Chen T.; Yi W.; Yan B.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
语种: 英语
中文关键词: Critical localization ; Momentum lattice ; Quantum simulation ; Topological phase
英文关键词: Energy gap ; Quantum chemistry ; Quantum optics ; Topology ; Critical localization ; Localisation ; Localised ; Localized state ; Many body ; Momentum lattice ; Quantum simulations ; Quasi-periodic lattices ; Topological phase ; Topological properties ; Momentum
英文摘要: Disorder and localization have dramatic influence on the topological properties of a quantum system. While strong disorder can close the band gap thus depriving topological materials of topological features, disorder may also induce topology from trivial band structures, wherein topological invariants are shared by completely localized states. Here we experimentally investigate a fundamentally distinct scenario where topology is identified in a critically localized regime, with eigenstates neither fully extended nor completely localized. Adopting the technique of momentum-lattice engineering for ultracold atoms, we implement a one-dimensional, generalized Aubry-André model with both diagonal and off-diagonal quasi-periodic disorder in momentum space, and characterize its localization and topological properties through dynamic observables. We then demonstrate the impact of interactions on the critically localized topological state, as a first experimental endeavor toward the clarification of many-body critical phase, the critical analogue of the many-body localized state. © 2021 Science China Press
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170454
Appears in Collections:气候变化与战略

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作者单位: Interdisciplinary Center of Quantum Information, State Key Laboratory of Modern Optical Instrumentation and Zhejiang Province Key Laboratory of Quantum Technology and Device of Physics Department, Zhejiang University, Hangzhou, 310027, China; CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China; CAS Center For Excellence in Quantum Information and Quantum Physics, Hefei, 230026, China; Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing, 210093, China

Recommended Citation:
Xiao T.,Xie D.,Dong Z.,et al. Observation of topological phase with critical localization in a quasi-periodic lattice[J]. Science Bulletin,2021-01-01
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