title: Collective oscillations of strongly correlated one-dimensional bosons on a lattice.
abstract: We study the dipole oscillations of strongly correlated 1D bosons, in the hard-core limit, on a lattice, by an exact numerical approach. We show that far from the regime where a Mott insulator appears in the system, damping is always present and increases for larger initial displacements of the trap, causing dramatic changes in the momentum distribution, n(k). When a Mott insulator sets in the middle of the trap, the center of mass barely moves after an initial displacement, and n(k) remains very similar to the one in the ground state. We also study changes introduced by the damping in the natural orbital occupations, and the revival of the center-of-mass oscillations after long times.
authors.affiliation: Physics Department, University of California, Davis, California 95616, USA.
authors.forename: M
authors.initials: M
authors.lastname: Rigol
authors.forename: V
authors.initials: V
authors.lastname: Rousseau
authors.forename: R T
authors.initials: RT
authors.lastname: Scalettar
authors.forename: R R P
authors.initials: RR
authors.lastname: Singh