title: Possibility of a first-order superfluid-Mott-insulator transition of spinor bosons in an optical lattice.
abstract: We study the superfluid-Mott-insulator transition of antiferromagnetic spin-1 bosons in an optical lattice described by a Bose-Hubbard model. Our variational study with the Gutzwiller variational wave function determines that the superfluid-Mott-insulator transition is a first-order one at a part of the phase boundary curve, contrary to the spinless case.
authors.affiliation: Department of Information Sciences, Kanagawa University, 2946 Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kimura
authors.forename: Shunji
authors.initials: S
authors.lastname: Tsuchiya
authors.forename: Susumu
authors.initials: S
authors.lastname: Kurihara