Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 23: Ultracold Plasmas and Rydberg Systems I (with A)

Q 23.5: Vortrag

Dienstag, 24. März 2015, 12:00–12:15, C/kHS

Quantum magnetism and topological ordering via Rydberg-dressing near Förster-resonances — •Rick van Bijnen and Thomas Pohl — Max Planck Institute for the Physics of Complex Systems, Dresden

We devise a cold-atom approach to realizing a broad range of bi-linear quantum magnets [1]. Our scheme is based on off-resonant single-photon excitation of Rydberg P-states, whose strong interactions and state-mixing are shown to yield controllable XYZ-interactions between effective spins, represented by different atomic ground states. Exploiting distinctive features of Förster-resonant Rydberg atom interactions, we obtain large spin-interactions, up to three orders of magnitude in excess of corresponding decoherence rates. We illustrate the concept on a spin-1 chain implemented with cold Rubidium atoms, and demonstrate that this permits the dynamical preparation of topological magnetic phases. Generally, the described approach provides a viable route to exploring quantum magnetism with dynamically tuneable (an)isotropic interactions as well as variable space- and spin-dimensions in cold-atom experiments.

[1] arXiv:1411.3118