Time-Resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices Journal Article uri icon



  • Quantum 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 measured coherent superexchange-mediated spin dynamics with coupling energies from 5 hertz up to 1 kilohertz. 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 and 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 that can be explained by the inclusion of direct nearest-neighbor interactions.

publication date

  • January 18, 2008

has restriction

  • green

Date in CU Experts

  • January 21, 2015 12:29 PM

Full Author List

  • Trotzky S; Cheinet P; FoĢˆlling S; Feld M; Schnorrberger U; Rey AM; Polkovnikov A; Demler EA; Lukin MD; Bloch I

author count

  • 10

Other Profiles

International Standard Serial Number (ISSN)

  • 0036-8075

Electronic International Standard Serial Number (EISSN)

  • 1095-9203

Additional Document Info

start page

  • 295

end page

  • 299


  • 319


  • 5861