Hidden Order and Symmetry Protected Topological States in Quantum Link Ladders

Phys Rev Lett. 2017 Nov 3;119(18):180402. doi: 10.1103/PhysRevLett.119.180402. Epub 2017 Nov 1.

Abstract

We show that, whereas spin-1/2 one-dimensional U(1) quantum-link models (QLMs) are topologically trivial, when implemented in ladderlike lattices these models may present an intriguing ground-state phase diagram, which includes a symmetry protected topological (SPT) phase that may be readily revealed by analyzing long-range string spin correlations along the ladder legs. We propose a simple scheme for the realization of spin-1/2 U(1) QLMs based on single-component fermions loaded in an optical lattice with s and p bands, showing that the SPT phase may be experimentally realized by adiabatic preparation.