Saito Hiroki, Ueda Masahito
Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan.
Phys Rev Lett. 2004 Nov 26;93(22):220402. doi: 10.1103/PhysRevLett.93.220402. Epub 2004 Nov 23.
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.
