Topological mid-gap states of Chern insulator with flux-superlattice

Department of Physics, Beijing Normal University - Beijing 100875, China

^(a) spkou@bnu.edu.cn (corresponding author)

Received: 5 January 2014
Accepted: 6 February 2014

Abstract

In this paper, based on the Haldane model, we study the Chern insulator with superlattice of π-fluxes. We find that there exist mid-gap states induced by the flux-superlattice. In particular, the mid-gap states have nontrivial topological properties, including the nonzero Chern number and the gapless edge states. We derive an effective tight-binding model to describe the topological mid-gap states and then study the mid-gap states by the effective tight-binding model. The results can be straightforwardly generalized to other two-dimensional topological insulators with flux-superlattice.