Uncover Topology by Quantum Quench Dynamics

作     者：Wei Sun Chang-Rui Yi Bao-Zong Wang Wei-Wei Zhang Barry C. Sanders Xiao-Tian Xu Zong-Yao Wang Joerg Schmiedmayer Youjin Deng Xiong-Jun Liu Shuai Chen Jian-Wei Pan 

作者机构：Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Shanghai 201315 China Chinese Academy of Sciences Center for Excellence: Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230326 China CAS-Alibaba Lab for Quantum Computation Shanghai 201315 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Centre for Engineered Quantum Systems School of Physics The University of Sydney Sydney New South Wales 2006 Australia Institute for Quantum Science and Technology University of Calgary Calgary Alberta T2N 1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario M5G 1Z8 Canada Vienna Center for Quantum Science and Technology Atominstitut TU Wien Stadionallee 2 1020 Vienna Austria 

出 版 物：《Physical Review Letters》 (物理评论快报)

年 卷 期：2018年第121卷第25期

页      面：250403-250403页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Australian Research Council, ARC Thousand Young Talents Program of China European Commission, EC European Research Council, ERC National Natural Science Foundation of China, NSFC, (11625522, 11674301, 11761161003) National Natural Science Foundation of China, NSFC EQuS, (CE110001013) Seventh Framework Programme, FP7, (320975) Seventh Framework Programme, FP7 National Key Research and Development Program of China, NKRDPC, (2016YFA0301601, 2016YFA0301604) National Key Research and Development Program of China, NKRDPC 

主　　题：Spin-orbit coupling Synthetic gauge fields Bose gases 

摘      要：Topological quantum states are characterized by nonlocal invariants. We present a new dynamical approach for ultracold-atom systems to uncover their band topology, and we provide solid evidence to demonstrate its experimental advantages. After quenching a two-dimensional (2D) Chern band, realized in an ultracold Rb87 gas from a trivial to a topological parameter regime, we observe an emerging ring structure in the spin dynamics during the unitary evolution, which uniquely corresponds to the Chern number for the postquench band. By extracting 2D bulk topology from the 1D ring pattern, our scheme displays simplicity and is insensitive to perturbations. This insensitivity enables a high-precision determination of the full phase diagram for the system’s band topology.