Real-space imaging of a topologically protected edge state with ultracold atoms in an amplitude-chirped optical lattice.
Real-space imaging of a topologically protected edge state with ultracold atoms in an amplitude-chirped optical lattice.
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DOI：
10.1038/ncomms13112
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发表时间：
2016-10-21
影响因子：
16.6
通讯作者：
Weitz, Martin
中科院分区：
文献类型：
--
作者：
Leder, Martin;Grossert, Christopher;Sitta, Lukas;Genske, Maximilian;Rosch, Achim;Weitz, Martin
为了描述聚乙炔链中的移动缺陷，Su，Schrieffer和Heeger提出了一个假设两种简并能量构型的模型，该模型由两个不同的拓扑相表征。一个直接的结果是在两个不同构型的区域之间的边界上出现了孤子类型的边缘态。除了首次洞察聚乙炔材料的电学性质外，对这种效应的兴趣还源于它与相对论场论中具有分数电荷的状态的密切联系。本文利用具有空间啁啾振幅的冷Rb原子的一维光学晶格，实验实现了原子物理系统中两个不同拓扑级的空间区之间的界面。通过光学实空间成像，我们直接观察到被限制在交叉点处的边缘态原子，并表征了这种状态以及相关能隙的大小。我们的发现为拓扑物质的表面态光谱和相互作用狄拉克系统的量子模拟提供了前景。物质的拓扑状态不能根据大部分物质的局部测量来区分。本文报道了用光学显微镜观察超冷原子一维系统中两个不同拓扑相之间的边缘状态。
To describe a mobile defect in polyacetylene chains, Su, Schrieffer and Heeger formulated a model assuming two degenerate energy configurations that are characterized by two different topological phases. An immediate consequence was the emergence of a soliton-type edge state located at the boundary between two regions of different configurations. Besides giving first insights in the electrical properties of polyacetylene materials, interest in this effect also stems from its close connection to states with fractional charge from relativistic field theory. Here, using a one-dimensional optical lattice for cold rubidium atoms with a spatially chirped amplitude, we experimentally realize an interface between two spatial regions of different topological order in an atomic physics system. We directly observe atoms confined in the edge state at the intersection by optical real-space imaging and characterize the state as well as the size of the associated energy gap. Our findings hold prospects for the spectroscopy of surface states in topological matter and for the quantum simulation of interacting Dirac systems. Topological states of matter cannot be distinguished on the basis of local measurements in the bulk of the material. Here the authors report on the observation of an edge state between two topological distinct phases of an ultracold atomic one-dimensional system using optical microscopy.
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