TY - JOUR
T1 - Topological Flat Bands from Dipolar Spin Systems
JF - Physical Review Letters
Y1 - 2012
A1 - Norman Y. Yao
A1 - Chris R. Laumann
A1 - Alexey V. Gorshkov
A1 - Steven D. Bennett
A1 - Eugene Demler
A1 - Peter Zoller
A1 - Mikhail D. Lukin
AB - 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.
VL - 109
UR - http://arxiv.org/abs/1207.4479v3
CP - 26
J1 - Phys. Rev. Lett.
U5 - 10.1103/PhysRevLett.109.266804
ER -