Z(2) topological insulators in ultracold atomic gases.
Z(2) topological insulators in ultracold atomic gases.
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DOI：
10.1103/physrevlett.107.145301
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发表时间：
2011-05
影响因子：
8.6
通讯作者：
B. Béri;N. Cooper
中科院分区：
文献类型：
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作者：
B. Béri;N. Cooper
我们描述了如何利用光学修饰法来产生具有非平凡Z(2)拓扑序的超冷原子的能带结构。通过对光场的简单条件，时间反转对称性得以保持。我们首先展示了如何构造在二维空间中产生Z(2)拓扑绝缘体的光学晶格。然后，我们描述了构造三维Z(2)拓扑绝缘子的一般方法。我们方法的一个主要特点是从近自由电子极限出发，以一种新的方式来理解Z(2)拓扑绝缘体。
We describe how optical dressing can be used to generate band structures for ultracold atoms with nontrivial Z(2) topological order. Time-reversal symmetry is preserved by simple conditions on the optical fields. We first show how to construct optical lattices that give rise to Z(2) topological insulators in two dimensions. We then describe a general method for the construction of three-dimensional Z(2) topological insulators. A central feature of our approach is a new way to understand Z(2) topological insulators starting from the nearly free electron limit.