两个碰撞偶极玻色-爱因斯坦凝聚体的坍缩观测
Observing collapse in two colliding dipolar Bose-Einstein condensates
摘要：
研究了两个具有纯偶极相互作用的玻色-爱因斯坦凝聚体的碰撞。一个稳定的纯偶极凝聚体是已知的稳定时，原子数是低于临界值。然而，塌缩可以发生在两个凝聚体之间的碰撞，由于局部密度波动，即使总原子数是临界值的一小部分。使用全三维数值模拟，我们观察到的崩溃引起的局部密度波动。为了将来的实验，我们提出的密度分布的时间依赖性，每个粒子的能量和凝聚体的最大密度。我们还讨论了坍缩时间作为两个凝聚体之间的相对相位的函数。
英文摘要：
We study the collision of two Bose-Einstein condensates with pure dipolar interaction. A stationary pure dipolar condensate is known to be stable when the atom number is below a critical value. However, collapse can occur during the collision between two condensates due to local density fluctuations even if the total atom number is only a fraction of the critical value. Using full three-dimensional numerical simulations, we observe the collapse induced by local density fluctuations. For the purpose of future experiments, we present the time dependence of the density distribution, energy per particle and the maximal density of the condensate. We also discuss the collapse time as a function of the relative phase between the two condensates.
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