Center-of-mass rotation and vortices in an attractive Bose gas
- Helsinki Institute of Physics, PL 64, FIN-00014 Helsingin yliopisto (Finland)
- Condensed Matter Theory Group, Royal Institute of Technology, SE-10691 Stockholm (Sweden)
- Department of Physics, University of Turku, FIN-20014 Turun yliopisto (Finland)
The rotational properties of an attractively interacting Bose gas are studied using analytical and numerical methods. We study perturbatively the ground-state phase space for weak interactions, and find that in an anharmonic trap the rotational ground states are vortex or center-of-mass rotational states; the crossover line separating these two phases is calculated. We further show that the Gross-Pitaevskii equation is a valid description of such a gas in the rotating frame and calculate numerically the phase-space structure using this equation. It is found that the transition between vortex and center-of-mass rotation is gradual; furthermore, the perturbative approach is valid only in an exceedingly small portion of phase space. We also present an intuitive picture of the physics involved in terms of correlated successive measurements for the center-of-mass state.
- OSTI ID:
- 20650120
- Journal Information:
- Physical Review. A, Vol. 71, Issue 2; Other Information: DOI: 10.1103/PhysRevA.71.023613; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
Vortex lattices in Bose-Einstein condensates: From the Thomas-Fermi regime to the lowest-Landau-level regime
Topological vortex formation in a Bose-Einstein condensate under gravitational field