title: Exact analysis of soliton dynamics in spinor Bose-Einstein condensates.
abstract: We propose an integrable model of a multicomponent spinor Bose-Einstein condensate in one dimension, which allows an exact description of the dynamics of bright solitons with spin degrees of freedom. We consider specifically an atomic condensate in the F=1 hyperfine state confined by an optical dipole trap. When the mean-field interaction is attractive (c(0)<0) and the spin-exchange interaction of a spinor condensate is ferromagnetic (c(2)<0), we prove that the system possesses a completely integrable point leading to the existence of multiple bright solitons. By applying results from the inverse scattering method, we analyze a collision law for two-soliton solutions and find that the dynamics can be explained in terms of the spin precession.
authors.affiliation: Department of Physics, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan. ieda@monet.phys.s.u-tokyo.ac.jp
authors.forename: Jun'ichi
authors.initials: J
authors.lastname: Ieda
authors.forename: Takahiko
authors.initials: T
authors.lastname: Miyakawa
authors.forename: Miki
authors.initials: M
authors.lastname: Wadati