%0 Journal Article
%T Topological bands with Chern number C=2 by dipolar exchange interactions
%A David Peter
%A Norman Y. Yao
%A Nicolai Lang
%A Sebastian D. Huber
%A Mikhail D. Lukin
%A Hans Peter B¨ąchler
%J Physics
%D 2014
%I arXiv
%R 10.1103/PhysRevA.91.053617
%X We demonstrate the realization of topological band structures by exploiting the intrinsic spin-orbit coupling of dipolar interactions in combination with broken time-reversal symmetry. The system is based on polar molecules trapped in a deep optical lattice, where the dynamics of rotational excitations follows a hopping Hamiltonian which is determined by the dipolar exchange interactions. We find topological bands with Chern number $C=2$ on the square lattice, while a very rich structure of different topological bands appears on the honeycomb lattice. We show that the system is robust against missing molecules. For certain parameters we obtain flat bands, providing a promising candidate for the realization of hard-core bosonic fractional Chern insulators.
%U http://arxiv.org/abs/1410.5667v2