Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices

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dc.creatorTrotzky, S.
dc.creatorCheinet, P.
dc.creatorFölling, S.
dc.creatorFeld, M.
dc.creatorSchnorrberger, U.
dc.creatorRey, A. M.
dc.creatorPolkovnikov, A.
dc.creatorDemler, E. A.
dc.creatorLukin, M. D.
dc.creatorBloch, I.
dc.date2007-12-12
dc.date.accessioned2026-07-07T09:32:50Z
dc.date.available2026-07-07T09:32:50Z
dc.descriptionQuantum mechanical superexchange interactions form the basis of quantum magnetism in strongly correlated electronic media. We report on the direct measurement of superexchange interactions with ultracold atoms in optical lattices. After preparing a spin-mixture of ultracold atoms in an antiferromagnetically ordered state, we measure a coherent superexchange-mediated spin dynamics with coupling energies from 5 Hz up to 1 kHz. By dynamically modifying the potential bias between neighboring lattice sites, the magnitude and sign of the superexchange interaction can be controlled, thus allowing the system to be switched between antiferromagnetic or ferromagnetic spin interactions. We compare our findings to predictions of a two-site Bose-Hubbard model and find very good agreement, but are also able to identify corrections which can be explained by the inclusion of direct nearest-neighbor interactions.
dc.description24 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0712.1853
dc.identifierhttp://arxiv.org/abs/0712.1853
dc.identifierScience, 319, p.295-299 (2008)
dc.identifierdoi:10.1126/science.1150841
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/158923
dc.subjectOther Condensed Matter
dc.titleTime-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
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