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Symmetry breaking in small rotating clouds of trapped ultracold Bose atoms
Dagnino, D.; Barberán Falcón, Núria; Osterloh, K.; Riera, A.; Lewenstein, M.
Universitat de Barcelona
We study the signatures of rotational and phase symmetry breaking in small rotating clouds of trapped ultracold Bose atoms by looking at rigorously defined condensate wave function. Rotational symmetry breaking occurs in narrow frequency windows, where energy degeneracy between the lowest energy states of different total angular momentum takes place. This leads to a complex condensate wave function that exhibits vortices clearly seen as holes in the density, as well as characteristic local phase patterns, reflecting the appearance of vorticities. Phase symmetry (or gauge symmetry) breaking, on the other hand, is clearly manifested in the interference of two independent rotating clouds.
Simetria (Física)
Estadística quàntica
Mecànica estadística
Symmetry (Physics)
Quantum statistics
Statistical mechanics
(c) The American Physical Society, 2007
The American Physical Society

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