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

TL;DR

This paper investigates how high spatial coherence in a tight trap leads to the destruction of an attractive bosonic condensate, revealing new stable branches and critical trap parameters.

Contribution

It introduces the analysis of high spatial coherence effects and finite-range interactions on the stability and structure of attractive Bose-Einstein condensates in tight traps.

Findings

High spatial coherence causes condensate destruction in tight traps.

Finite-range interactions lead to a stable high-density branch.

Universal behavior observed in the new stable branch.

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.