Detecting the Chern number of topological Weyl semimetals in 3D optical lattices
Detecting the Chern number of topological Weyl semimetals in 3D optical lattices
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DOI：
10.1088/1612-2011/13/6/065201
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发表时间：
2016-04
影响因子：
1.7
通讯作者：
Dan-Wei Zhang;S. Cao
中科院分区：
文献类型：
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作者：
Dan-Wei Zhang;S. Cao
我们提出了一个直接研究光晶格中拓扑Weyl半金属的Chern数的方案。Weyl半金属态可以用囚禁在三维光学晶格中的超冷费米子原子来实现，并由kz依赖的Chern数来拓扑表征，其中kz是离面准动量.我们证明了与数值模拟，这种特征的拓扑不变量可以提取的混合Wannier中心的光晶格中的移动，基于粒子泵浦方法。通过原位测量原子密度，直接揭示了外尔半金属态的拓扑性质。
We propose a realistic scheme to directly probe the Chern number of topological Weyl semimetals in optical lattices. The Weyl semimetal states can be realized with ultracold fermionic atoms trapped in three-dimensional optical lattices, and are topologically characterized by kz-dependent Chern number, where kz is the out-of-plane quasimomentum. We demonstrate with numerical simulations that this characteristic topological invariant can be extracted from the shift of the hybrid Wannier center in the optical lattice, based on the particle pumping approach. Through in situ measurement of atomic density, the topological properties of the Weyl semimetal states are then directly revealed.