Symmetry breaking in small rotating clouds of trapped ultracold Bose atoms

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 sta...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2007-07, Vol.76 (1), Article 013625
Main Authors: Dagnino, D., Barberán, N., Osterloh, K., Riera, A., Lewenstein, M.
Format: Article
Language:English
Subjects:
ANGULAR MOMENTUM
ATOMIC AND MOLECULAR PHYSICS
ATOMS
BOSE-EINSTEIN CONDENSATION
BOSONS
CONDENSATES
DENSITY
Estadística quàntica
GAUGE INVARIANCE
INTERFERENCE
Mecànica estadística
Quantum statistics
Simetria (Física)
Statistical mechanics
SYMMETRY
Symmetry (Physics)
SYMMETRY BREAKING
TEMPERATURE RANGE 0000-0013 K
TRAPPING
VORTICES
WAVE FUNCTIONS
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Summary: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.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.76.013625