Condensation dynamics in a quantum-quenched Bose gas.
Condensation dynamics in a quantum-quenched Bose gas.
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量子淬灭玻色气体中的凝聚动力学。
DOI：
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发表时间：
2011
影响因子：
8.6
通讯作者：
Z. Hadzibabic
中科院分区：
文献类型：
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作者：
Robert P. Smith;S. Beattie;Stuart Moulder;R. L. Campbell;Z. Hadzibabic
通过淬灭部分凝聚玻色气体中的相互作用强度，我们创造了一种“过饱和”蒸气，它具有比平衡时更多的热原子。随后，即使温度（T）升高，凝聚原子的数量（N（0））也增加，并且总原子数减少。我们表明，系统的非平衡演化是等能的，并且对于小的初始N（0），观察到T和N（0）动力学之间的明显分离，从而明确地证明了理论上预期的凝聚增长的“两步”图像。对于增加的初始N（0）值，我们观察到一个交叉到经典的弛豫动力学。所观察到的猝灭效应的大小可以用一个简单的相互作用的谐波捕获原子气体的状态方程来解释。
By quenching the strength of interactions in a partially condensed Bose gas, we create a "supersaturated" vapor which has more thermal atoms than it can contain in equilibrium. Subsequently, the number of condensed atoms (N(0)) grows even though the temperature (T) rises and the total atom number decays. We show that the nonequilibrium evolution of the system is isoenergetic and, for small initial N(0), observe a clear separation between T and N(0) dynamics, thus explicitly demonstrating the theoretically expected "two-step" picture of condensate growth. For increasing initial N(0) values, we observe a crossover to classical relaxation dynamics. The size of the observed quench-induced effects can be explained using a simple equation of state for an interacting harmonically trapped atomic gas.