Destruction of attractive bosonic cloud due to high spatial coherence in tight trap
Abstract
We study coherence of a trapped bosonic cloud with attractive finite-range interaction in a tight harmonic trap. One-body density and pair-distribution function in the ground state for different trap sizes are calculated. We also calculate healing length and the correlation length which signify the presence of high spatial coherence in a very tight trap leading to the destruction of the condensate for a fixed particle number. This is in marked variance with the usual collapse of the attractive metastable condensate when N > Ncr . Thus we investigate the critical frequency and critical size of the trap for the existence of attractive Bose-Einstein condensation. The finite-range interaction gives a nonlocal effect in the effective many-body potential, and we observe a high-density stable branch besides the known metastable branch. Moreover, the new branch shows universal behavior even in the very tight trap.
Keywords
Cite
@article{arxiv.1111.1079,
title = {Destruction of attractive bosonic cloud due to high spatial coherence in tight trap},
author = {Anindya Biswas and Barnali Chakrabarti and Tapan Kumar Das and Luca Salasnich},
journal= {arXiv preprint arXiv:1111.1079},
year = {2012}
}