title: Observation of dipole-induced spin texture in an 87Rb Bose-Einstein condensate.
abstract: We report the formation of spin texture resulting from the magnetic dipole-dipole interaction in a spin-2 87Rb Bose-Einstein condensate. The spinor condensate is prepared in the transversely polarized spin state and the time evolution is observed under a magnetic field of 90 mG with a gradient of 3  mG/cm using Stern-Gerlach imaging. The experimental results are compared with numerical simulations of the Gross-Pitaevskii equation, which reveals that the observed spatial modulation of the longitudinal magnetization is due to the spin precession in an effective magnetic field produced by the dipole-dipole interaction. These results show that the dipole-dipole interaction has considerable effects even on spinor condensates of alkali metal atoms.
authors.affiliation: Department of Physics, Gakushuin University, Toshima, Tokyo 171-8588, Japan.
authors.forename: Yujiro
authors.initials: Y
authors.lastname: Eto
authors.affiliation: Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Saito
authors.affiliation: Department of Physics, Gakushuin University, Toshima, Tokyo 171-8588, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Hirano