Europhys. Lett.
Volume 67, Number 1, July 2004
Page(s) 8 - 13
Section General
Published online 01 June 2004
Europhys. Lett., 67 (1) , pp. 8-13 (2004)
DOI: 10.1209/epl/i2004-10047-3

Continuous configuration-interaction for condensates in a ring

O. 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