Gutzwiller study of spin-1 bosons in an optical lattice under a magnetic field

T. Kimura, S. Tsuchiya, M. Yamashita, S. Kurihara

    Research output: Contribution to journalArticle

    Abstract

    We study spin-1 bosons in an optical lattice under a magnetic field with the Gutzwiller approximation for the Bose-Hubbard model. Phase boundary curves between superfluids and Mott insulators depend continuously on the magnetic field, and this provides better results than those obtained with the perturbative mean-field approximation. The phase boundary curve as a function of magnetic field has a sharp cusp structure under certain circumstances. In superfluid phases, both the spin magnetizations and fluctuations in the total number of bosons show strong magnetic field dependence, which is related to the fact that both first-and second-order transitions appear on the phase boundary curve according to the magnetic field.

    Original languageEnglish
    Pages (from-to)54-59
    Number of pages6
    JournalLaser Physics
    Volume17
    Issue number1
    DOIs
    Publication statusPublished - 2007 Jan

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Physics and Astronomy (miscellaneous)

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