TY - JOUR
T1 - Topological phases in ultracold polar-molecule quantum magnets
JF - Physical Review B
Y1 - 2013
A1 - Salvatore R. Manmana
A1 - E. M. Stoudenmire
A1 - Kaden R. A. Hazzard
A1 - Ana Maria Rey
A1 - Alexey V. Gorshkov
AB - We show how to use polar molecules in an optical lattice to engineer quantum spin models with arbitrary spin S >= 1/2 and with interactions featuring a direction-dependent spin anisotropy. This is achieved by encoding the effective spin degrees of freedom in microwave-dressed rotational states of the molecules and by coupling the spins through dipolar interactions. We demonstrate how one of the experimentally most accessible anisotropies stabilizes symmetry protected topological phases in spin ladders. Using the numerically exact density matrix renormalization group method, we find that these interacting phases -- previously studied only in the nearest-neighbor case -- survive in the presence of long-range dipolar interactions. We also show how to use our approach to realize the bilinear-biquadratic spin-1 and the Kitaev honeycomb models. Experimental detection schemes and imperfections are discussed.
VL - 87
UR - http://arxiv.org/abs/1210.5518v2
CP - 8
J1 - Phys. Rev. B
U5 - 10.1103/PhysRevB.87.081106
ER -