Novel Topological Phase with a Zero Berry Curvature

作者：Liu, Feng^*; Wakabayashi, Katsunori

来源：Physical Review Letters, 2017, 118(7): 076803.

DOI：10.1103/PhysRevLett.118.076803

• GEOMETRIC PHASE
• INSULATORS

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.

• 出版日期2017-2-17