Emergence of BLOCH bands in a rotating Bose-Einstein condensate.
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.
Saito
Hiroki
H
Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
Ueda
Masahito
M