Weyl semimetals in optical lattices: moving and merging of Weyl points, and hidden symmetry at Weyl points.
Weyl semimetals in optical lattices: moving and merging of Weyl points, and hidden symmetry at Weyl points.
复制标题
光学晶格中的外尔半金属:外尔点的移动和合并,以及外尔点的隐藏对称性
DOI:
10.1038/srep33512
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发表时间:
2016-09-20
影响因子:
4.6
通讯作者:
Chen W
中科院分区:
文献类型:
--
作者:
Hou JM;Chen W
We propose to realize Weyl semimetals in a cubic optical lattice. We find that there exist three distinct Weyl semimetal phases in the cubic optical lattice for different parameter ranges. One of them has two pairs of Weyl points and the other two have one pair of Weyl points in the Brillouin zone. For a slab geometry with (010) surfaces, the Fermi arcs connecting the projections of Weyl points with opposite topological charges on the surface Brillouin zone is presented. By adjusting the parameters, the Weyl points can move in the Brillouin zone. Interestingly, for two pairs of Weyl points, as one pair of them meet and annihilate, the originial two Fermi arcs coneect into one. As the remaining Weyl points annihilate further, the Fermi arc vanishes and a gap is opened. Furthermore, we find that there always exists a hidden symmetry at Weyl points, regardless of anywhere they located in the Brillouin zone. The hidden symmetry has an antiunitary operator with its square being −1.
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