Liu Feng, Wakabayashi Katsunori
Department of Nanotechnology for Sustainable Energy, School of Science and Technology, Kwansei Gakuin University, Gakuen 2-1, Sanda 669-1337, Japan.
Department of Naotechnology for Sustainable Energy, School of Science and Technology, Kwansei Gakuin University, Gakuen 2-1, Sanda 669-1337, Japan and National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba 305-0044, Japan.
Phys Rev Lett. 2017 Feb 17;118(7):076803. doi: 10.1103/PhysRevLett.118.076803.
We present a two-dimensional (2D) lattice model that exhibits a nontrivial topological phase in the absence of the Berry curvature. Instead, the Berry connection provides the topological nontrivial phase in the model, whose integration over the momentum space, the so-called 2D Zak phase, yields a fractional wave polarization in each direction. These fractional wave polarizations manifest themselves as degenerated edge states with opposite parities in the model.
我们提出了一种二维（2D）晶格模型，该模型在没有贝里曲率的情况下展现出非平凡拓扑相。相反，贝里联络在该模型中提供了拓扑非平凡相，其在动量空间上的积分，即所谓的二维扎克相，在每个方向上产生分数波极化。这些分数波极化在模型中表现为具有相反宇称的简并边缘态。
