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arXiv · 1111.1079

Destruction of attractive bosonic cloud due to high spatial coherence in tight trap

Anindya Biswas·Barnali Chakrabarti·Tapan Kumar Das·Luca Salasnich
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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.

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Anindya Biswas, Barnali Chakrabarti, Tapan Kumar Das, Luca Salasnich. 2011-11-04. Destruction of attractive bosonic cloud due to high spatial coherence in tight trap. https://doi.org/10.1103/physreva.84.043631

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