Fractional-filling loophole insulator domains for ultracold bosons in optical superlattices

Simple item page
dc.creatorBuonsante, Pierfrancesco
dc.creatorPenna, Vittorio
dc.creatorVezzani, Alessandro
dc.date2004-07-30
dc.date2005-01-10
dc.date.accessioned2026-07-07T02:59:31Z
dc.date.available2026-07-07T02:59:31Z
dc.descriptionThe zero-temperature phase diagram of a Bose-Einstein condensate confined in realistic one-dimensional $\ell$-periodic optical superlattices is investigated. The system of interacting bosons is modeled in terms of a Bose-Hubbard Hamiltonian whose site-dependent local potentials and hopping amplitudes reflect the periodicity of the lattice partition in $\ell$-site cells. Relying on the exact mapping between the hard-core limit of the boson Hamiltonian and the model of spinless noninteracting fermions, incompressible insulator domains are shown to exist for rational fillings that are predicted to be compressible in the atomic limit. The corresponding boundaries, qualitatively described in a {\it multiple-site} mean-field approach, are shown to exhibit an unusual loophole shape. A more quantitative description of the loophole domain boundaries at half filling for the special case $\ell$ = 2 is supplied in terms of analytic strong-coupling expansions and quantum Monte Carlo simulations.
dc.description5 pages, 3 figures; final version; bibliography updated; acknowledgments included
dc.identifierhttps://arxiv.org/abs/cond-mat/0407812
dc.identifierhttp://arxiv.org/abs/cond-mat/0407812
dc.identifierPhys. Rev. A 70, 061603 (2004)
dc.identifierdoi:10.1103/PhysRevA.70.061603
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24540
dc.subjectStatistical Mechanics
dc.titleFractional-filling loophole insulator domains for ultracold bosons in optical superlattices
dc.typetext

Files

Collections

arXiv