Volume 83, Number 3, August 2008
Article Number 30012
Number of page(s) 5
Section General
Published online 29 July 2008
EPL, 83 (2008) 30012
DOI: 10.1209/0295-5075/83/30012

N-body Efimov states of trapped bosons

M. Thøgersen, D. V. Fedorov and A. S. Jensen

IFA, Aarhus University - 8000 Aarhus C, Denmark, EU

received 4 February 2008; accepted in final form 17 June 2008; published August 2008
published online 29 July 2008

We demonstrate the possibility of existence of meta-stable N-body Efimov states in trapped Bose systems with large scattering length. We calculate spectra of trapped systems of N=3, 4, 5, 6, and 7 bosons using a stochastic variational method with a restricted correlated Gaussian basis. For each system the calculations reveal a series of Efimov states where the energy and the r.m.s. radius exhibit the characteristic exponential dependence upon the state number. We also estimate the contribution of these states to the recombination rate of Bose-Einstein condensates.

03.75.Hh - Static properties of condensates; thermodynamical, statistical, and structural properties.
03.75.Nt - Other Bose-Einstein condensation phenomena.
21.45.-v - Few-body systems.

© EPLA 2008