Journal
EUROPHYSICS LETTERS
Volume 67, Issue 1, Pages 8-13Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2004-10047-3
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A continuous configuration-interaction approach for condensates in a ring is introduced. In its simplest form this approach utilizes for attractive condensates the Gross-Pitaevskii symmetry-broken solution and arrives at a ground state of correct symmetry. Furthermore, the energy found is lower than the Gross-Pitaevskii one and, with increasing number of particles and/or strength of inter-particle interaction, is even lower than that accessed by tractable diagonalization of the many-body Hamiltonian. Implications also to excited states are briefly discussed.
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