Journal
PHYSICAL REVIEW A
Volume 78, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.78.063623
Keywords
Bose-Einstein condensation
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A Bose-Einstein condensate produced by a Hamiltonian which is rotationally or translationally symmetric may be fragmented as a direct result of these symmetries. A corresponding mean-field unfragmented state, with an identical energy to leading order in the number of particles, can generally be constructed. As a consequence, vanishingly weak symmetry-breaking perturbations destabilize the fragmented state, which would thus be extremely difficult to realize experimentally and lead to an unfragmented condensate.
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