Hidden-Symmetry-Protected Topological Semimetals on a Square Lattice
Hidden-Symmetry-Protected Topological Semimetals on a Square Lattice
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方格子上的隐藏对称性保护的拓扑半金属
DOI：
10.1103/physrevlett.111.130403
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发表时间：
2013-09-24
影响因子：
8.6
通讯作者：
Hou, Jing-Min
中科院分区：
文献类型：
--
作者：
Hou, Jing-Min
We study a two-dimensional fermionic square lattice, which supports the existence of a two-dimensional Weyl semimetal, quantum anomalous Hall effect, and 2 pi-flux topological semimetal in different parameter ranges. We show that the band degenerate points of the two-dimensional Weyl semimetal and 2 pi-flux topological semimetal are protected by two distinct novel hidden symmetries, which both correspond to antiunitary composite operations. When these hidden symmetries are broken, a gap opens between the conduction and valence bands, turning the system into a insulator. With appropriate parameters, a quantum anomalous Hall effect emerges. The degenerate point at the boundary between the quantum anomalous Hall insulator and trivial band insulator is also protected by the hidden symmetry.
