title: Dynamics of narrow bright solitons in an array of attractive atoms in a Bose-Einstein condensate.
abstract: We study the dynamics of a narrow bright soliton in a one-dimensional lattice of condensed attractive atoms when the soliton width is comparable to the lattice spacing. If a momentum is imprinted to a stationary state, the soliton can have oscillations around a site or it can undergo a random motion along the array. The motion is very sensitive to the atomic background distribution, and a thermal cloud or quantum field fluctuations can induce a random motion of the soliton.
authors.affiliation: Dipartimento di Fisica, Università di Firenze, Via Sansone 1, 50019 Sesto Fiorentino (FI), Italy.
authors.forename: A
authors.initials: A
authors.lastname: Montina
authors.forename: F T
authors.initials: FT
authors.lastname: Arecchi