Chen Chao, Liu Run-Ze, Wu Jizhou, Su Zu-En, Ding Xing, Qin Jian, Wang Lin, Zhang Wei-Wei, He Yu, Wang Xi-Lin, Lu Chao-Yang, Li Li, Sanders Barry C, Liu Xiong-Jun, Pan Jian-Wei
Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China.
Phys Rev Lett. 2023 Sep 29;131(13):133601. doi: 10.1103/PhysRevLett.131.133601.
Berry curvature is a fundamental element to characterize topological quantum physics, while a full measurement of Berry curvature in momentum space was not reported for topological states. Here we achieve two-dimensional Berry curvature reconstruction in a photonic quantum anomalous Hall system via Hall transport measurement of a momentum-resolved wave packet. Integrating measured Berry curvature over the two-dimensional Brillouin zone, we obtain Chern numbers corresponding to -1 and 0. Further, we identify bulk-boundary correspondence by measuring topology-linked chiral edge states at the boundary. The full topological characterization of photonic Chern bands from Berry curvature, Chern number, and edge transport measurements enables our photonic system to serve as a versatile platform for further in-depth study of novel topological physics.
贝里曲率是表征拓扑量子物理的一个基本要素,然而对于拓扑态,尚未有在动量空间中对贝里曲率进行完整测量的报道。在此,我们通过对动量分辨波包进行霍尔输运测量,在一个光子量子反常霍尔系统中实现了二维贝里曲率重构。在二维布里渊区上对测量得到的贝里曲率进行积分,我们得到了对应于 -1 和 0 的陈数。此外,我们通过测量边界处与拓扑相关的手性边缘态来确定体边对应关系。通过贝里曲率、陈数和边缘输运测量对光子陈能带进行的完整拓扑表征,使我们的光子系统能够作为一个通用平台,用于进一步深入研究新型拓扑物理。