T. Fukui, K. -I. Imura, Y. Hatsugai
We explore novel topological phases realized in a superlattice system based on the Wilson-Dirac model. Our main focus is on a two-dimensional analogue of the weak topological insulator phases. We find such phases as are characterized by gapless edge states that are protected by symmetry but in a way sensitive to the relative orientation of the edge to the superlattice structure. We show that manifest and hidden reflection symmetries protect such weak topological phases, and propose bulk Z2 indices responsible for the topological protection of the edge states.
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http://arxiv.org/abs/1304.6200
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