title: Mott insulators without symmetry breaking.
abstract: We present theoretical models, in one and two space dimensions, that exhibit Mott insulating ground states at fractional occupations without any symmetry breaking. The Hamiltonians of these models are nonlocal in configuration space, but local in phase space.
authors.affiliation: Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: Dung-Hai
authors.initials: DH
authors.lastname: Lee
authors.forename: Jon Magne
authors.initials: JM
authors.lastname: Leinaas