Observation of the topological Anderson insulator in disordered atomic wires
Observation of the topological Anderson insulator in disordered atomic wires
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DOI：
10.1126/science.aat3406
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发表时间：
2018-11-23
期刊：
影响因子：
56.9
通讯作者：
Gadway, Bryce
中科院分区：
文献类型：
--
作者：
Meier, Eric J.;An, Fangzhao Alex;Gadway, Bryce
拓扑结构和无序性对量子输运具有丰富的综合影响。为了探究它们之间的相互作用，我们基于激光驱动的超冷原子离散动量态耦合，通过光谱哈密顿工程合成了具有可控无序性的一维手性对称线。在突然淬火后测量拓扑指标的整体演化，我们观察到了拓扑安德森绝缘体相，其中增加的无序性将线的能带结构从拓扑平凡驱动到非平凡。此外，我们观察到拓扑非平凡线对弱无序的稳健性，并测量了在强无序存在时向平凡相的转变。这个量子模拟平台中的原子相互作用可能使强相互作用拓扑流体的实现成为可能。
Topology and disorder have a rich combined influence on quantum transport. To probe their interplay, we synthesized one-dimensional chiral symmetric wires with controllable disorder via spectroscopic Hamiltonian engineering, based on the laser-driven coupling of discrete momentum states of ultracold atoms. Measuring the bulk evolution of a topological indicator after a sudden quench, we observed the topological Anderson insulator phase, in which added disorder drives the band structure of a wire from topologically trivial to nontrivial. In addition, we observed the robustness of topologically nontrivial wires to weak disorder and measured the transition to a trivial phase in the presence of strong disorder. Atomic interactions in this quantum simulation platform may enable realizations of strongly interacting topological fluids.