Combined topological and Landau order from strong correlations in Chern bands.
Combined topological and Landau order from strong correlations in Chern bands.
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根据陈能带中的强相关性组合拓扑和朗道阶
DOI：
10.1103/physrevlett.113.216404
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发表时间：
2014
影响因子：
8.6
通讯作者：
M. Daghofer
中科院分区：
文献类型：
--
作者：
S. Kourtis;M. Daghofer
我们提出了一类具有拓扑和常规朗道序的态，它们是由强相互作用的无自旋费米子在分数填充和拓扑非平凡的陈数带中产生的。这些量子态显示了分数陈氏绝缘体的特征，例如分数霍尔电导率和插入磁通量时基态能级的互换。此外，它们还表现出电荷序和相关的额外的平凡基态简并。带混合和几何挫折的电荷模式放置这些晶格状态显着超出了单带的描述。
We present a class of states with both topological and conventional Landau order that arise out of strongly interacting spinless fermions in fractionally filled and topologically nontrivial bands with Chern number. These quantum states show the features of fractional Chern insulators, such as fractional Hall conductivity and interchange of ground-state levels upon insertion of a magnetic flux. In addition, they exhibit charge order and a related additional trivial ground-state degeneracy. Band mixing and geometric frustration of the charge pattern place these lattice states markedly beyond a single-band description.