title: Deconfinement and phase diagram of bosons in a linear optical lattice with a particle reservoir.
abstract: We investigate the zero-temperature phases of bosons in a one-dimensional optical lattice with an explicit tunnel coupling to a Bose-condensed particle reservoir. Renormalization group analysis of this system is shown to reveal three phases: one in which the linear system is fully phase locked to the reservoir; one in which Josephson vortices between the one-dimensional system and the particle reservoir deconfine due to quantum fluctuations, leading to a decoupled state in which the one-dimensional system is metallic; and one in which the one-dimensional system is in a Mott insulating state.
authors.affiliation: Department of Physics, Berea College, Berea, KY 40404, USA.
authors.forename: Kingshuk
authors.initials: K
authors.lastname: Majumdar
authors.forename: H A
authors.initials: HA
authors.lastname: Fertig