Hidden Order and Symmetry Protected Topological States in Quantum Link Ladders.
Hidden Order and Symmetry Protected Topological States in Quantum Link Ladders.
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DOI：
10.1103/physrevlett.119.180402
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发表时间：
2017-07
影响因子：
8.6
通讯作者：
Lorenzo Cardarelli;S. Greschner;Luis Santos
中科院分区：
文献类型：
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作者：
Lorenzo Cardarelli;S. Greschner;Luis Santos
我们发现，虽然自旋为1/2的一维U（1）量子链接模型（QLM）在拓扑上是平凡的，但当在梯形晶格中实现时，这些模型可能会呈现出一个有趣的基态相图，其中包括一个对称性保护拓扑（SPT）相，可以通过分析沿着梯形腿的长程弦自旋相关来容易地揭示。我们提出了一个简单的方案，用于实现自旋1/2 U（1）QLM的基础上的单组分费米子加载在一个光学晶格的s和p带，表明SPT阶段可以通过绝热制备实验实现。
We show that, whereas spin-1/2 one-dimensional U(1) quantum-link models (QLMs) are topologically trivial, when implemented in ladderlike lattices these models may present an intriguing ground-state phase diagram, which includes a symmetry protected topological (SPT) phase that may be readily revealed by analyzing long-range string spin correlations along the ladder legs. We propose a simple scheme for the realization of spin-1/2 U(1) QLMs based on single-component fermions loaded in an optical lattice with s and p bands, showing that the SPT phase may be experimentally realized by adiabatic preparation.