Experimental reconstruction of the Berry curvature in a Floquet Bloch band
Experimental reconstruction of the Berry curvature in a Floquet Bloch band
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DOI：
10.1126/science.aad4568
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发表时间：
2016-05-27
期刊：
影响因子：
56.9
通讯作者：
Weitenberg, C.
中科院分区：
文献类型：
--
作者：
Flaeschner, N.;Rem, B. S.;Weitenberg, C.
在量子霍尔系统或陈氏绝缘体等固态系统中，拓扑特性是许多迷人现象的核心。能带的拓扑结构可以通过Berry曲率的分布来描述，Berry曲率描述了布里渊区本征态的几何形状。在六方光学晶格中使用费米子超冷原子，我们利用共振驱动设计了布洛赫带的贝里曲率，并展示了对随后的贝里曲率的完全动量分辨测量。我们的结果为探索拓扑带结构中相互作用的有趣物质相铺平了道路。
Topological properties lie at the heart of many fascinating phenomena in solid-state systems such as quantum Hall systems or Chern insulators. The topology of the bands can be captured by the distribution of Berry curvature, which describes the geometry of the eigenstates across the Brillouin zone. Using fermionic ultracold atoms in a hexagonal optical lattice, we engineered the Berry curvature of the Bloch bands using resonant driving and show a full momentum-resolved measurement of the ensuing Berry curvature. Our results pave the way to explore intriguing phases of matter with interactions in topological band structures.