title: Emergence of BLOCH bands in a rotating Bose-Einstein condensate.
abstract: A rotating Bose-Einstein condensate is shown to exhibit a Bloch band structure even in the absence of a periodic potential. Vortices enter the condensate via Bragg reflection if the frequency of a rotating drive is adiabatically increased or decreased, or if the interaction is adiabatically changed at a constant rotating drive. A localized state analogous to a gap soliton in a periodic system is predicted to occur near the edge of the Brillouin zone.
authors.affiliation: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Saito
authors.forename: Masahito
authors.initials: M
authors.lastname: Ueda