Deconfinement and phase diagram of bosons in a linear optical lattice with a particle reservoir

Details Deconfinement and phase diagram of bosons in a linear optical lattice with a particle reservoir Deconfinement and phase diagram of bosons in a linear optical lattice with a particle reservoir

2004-05-06

arxiv.org/abs/cond-mat/0405114v3

Phys. Rev. Lett. 94, 220402 (2005)

Physics

Condensed Matter

Statistical Mechanics

Revised version. Four pages and three figures. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.220402

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.

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