Continuous configuration-interaction for condensates in a ringO. E. Alon, A. I. Streltsov, K. Sakmann and L. S. Cederbaum
Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
(Received 2 April 2004; accepted in final form 3 May 2004)
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.
03.75.Hh - Static properties of condensates; thermodynamical, statistical and structural properties.
05.30.Jp - Boson systems.
© EDP Sciences 2004