%0 Journal Article
%J Physical Review Letters
%D 2012
%T Topological Flat Bands from Dipolar Spin Systems
%A Norman Y. Yao
%A Chris R. Laumann
%A Alexey V. Gorshkov
%A Steven D. Bennett
%A Eugene Demler
%A Peter Zoller
%A Mikhail D. Lukin
%X We propose and analyze a physical system that naturally admits two-dimensional topological nearly flat bands. Our approach utilizes an array of three-level dipoles (effective S = 1 spins) driven by inhomogeneous electromagnetic fields. The dipolar interactions produce arbitrary uniform background gauge fields for an effective collection of conserved hardcore bosons, namely, the dressed spin-flips. These gauge fields result in topological band structures, whose bandgap can be larger than the corresponding bandwidth. Exact diagonalization of the full interacting Hamiltonian at half-filling reveals the existence of superfluid, crystalline, and supersolid phases. An experimental realization using either ultra-cold polar molecules or spins in the solid state is considered.
%B Physical Review Letters
%V 109
%8 2012/12/26
%G eng
%U http://arxiv.org/abs/1207.4479v3
%N 26
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.109.266804