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Thomas Pohl

Quantum Magnetism and Topological Ordering via Rydberg Dressing near Forster Resonances

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We devise a cold-atom approach to realizing a broad range of bilinear quantum magnets. Our scheme is based on off-resonant single-photon excitation of Rydberg P states (Rydberg dressing), whose strong interactions are shown to yield controllable XYZ interactions between effective spins, represented by different atomic ground states. The distinctive features of Forster-resonant Rydberg atom interactions are exploited to enhance the effectiveness of Rydberg dressing and, thereby, yield large spin interactions that greatly exceed the 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 tunable (an) isotropic interactions as well as variable space and spin dimensions in cold-atom experiments.

Original languageEnglish
Article number243002
JournalPhysical Review Letters
Volume114
Issue24
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 17 Jun 2015
Externally publishedYes

    Research areas

  • SPIN CHAINS, SIMULATION, MOLECULES, DYNAMICS, LATTICE, STATE

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