Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 19: Cold atoms IV - topological systems (joint session A/Q)

Q 19.5: Vortrag

Montag, 5. März 2018, 17:15–17:30, K 0.011

Hidden order and symmetry protected topological states in quantum link ladders — •Lorenzo Cardarelli¹, Sebastian Greschner², and Luis Santos¹ — ¹Institut für Theoretische Physik, Leibniz Universität Hannover, 30167 Hannover, Germany — ²Department of Quantum Matter Physics, University of Geneva , 1211 Geneva, Switzerland

We show that whereas spin-1/2 one-dimensional U(1) quantum-link models (QLMs) are topologically trivial, when implemented in ladder-like 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.