标题： 紧密陷阱中由于高空间相干性导致的吸引玻色云破坏 显示英文标题

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

摘要： 我们研究在紧密谐波势阱中具有吸引性有限范围相互作用的束缚玻色云的相干性。计算了不同势阱尺寸下基态中的单体密度和对分布函数。我们还计算了愈合长度和相关长度，这些参数表明在非常紧密的势阱中存在高空间相干性，导致固定粒子数下凝聚体的破坏。这与通常情况下当N > Ncr时吸引性亚稳凝聚体的坍缩形成明显对比。因此，我们研究了吸引性玻色-爱因斯坦凝聚存在的临界频率和势阱临界尺寸。有限范围的相互作用在有效多体势中产生非局域效应，我们观察到除了已知的亚稳分支外，还有一个高密度稳定分支。此外，新分支即使在非常紧密的势阱中也表现出普遍行为。 显示英文摘要

摘要： 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.