Overcritical rotation of a trapped Bose-Einstein condensate

Year: 2001

Authors: Recati A., Zambelli F., Stringari S.

Autors Affiliation: International School of Advanced Studies, Via Beirut 2/4, I-34014 Trieste, Italy;
Dipartimento di Fisica, Università di Trento and Istituto Nazionale per la Fisica della Materia, I-38050 Povo, Italy

Abstract: The rotational motion of an interacting Bose Einstein condensate confined by a harmonic trap is investigated by solving the hydrodynamic equations of superfluids, with the irrotationality constraint for the velocity field. We point out the occurrence of an overcritical branch where the system can rotate with angular velocity larger than the oscillator frequencies. We show that in the case of isotropic trapping the system exhibits a bifurcation from an axisymmetric to a triaxial configuration, as a consequence of the interatomic forces. The dynamical stability of the rotational motion with respect to the dipole and quadrupole oscillations is explicitly discussed.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 86 (3)      Pages from: 377  to: 380

KeyWords: Bose-Eistein condesates; spontaneeous symmetry breaking; Dinamical instabilties
DOI: 10.1103/PhysRevLett.86.377

Citations: 121
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