Novel Topological Phase with a Zero Berry Curvature

カテゴリ:研究業績 

2017年2月18日

Novel Topological Phase with a Zero Berry Curvature
Feng Liu and Katsunori Wakabayashi
Phys. Rev. Lett. 118, 076803 (2017)
DOI: 10.1103/PhysRevLett.118.076803

Abstract
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.

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