钠原子气体中的玻色-爱因斯坦凝聚

K. B. Davis, M. Mewes, M. R. Andrews, N. V. Druten, D. Durfee, D. M. Kurn, W. Ketterle
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引用次数: 3

摘要

我们已经观察到钠原子的玻色-爱因斯坦凝聚。原子被困在一个利用磁力和光力的新型陷阱中。蒸发冷却使相空间密度在7秒内提高了6个数量级。冷凝物的原子密度超过1014cm23,可达53105个。玻色凝聚的显著特征是在临界温度2 mK以下突然出现双峰速度分布。该分布由各向同性热分布和归因于致密凝聚膨胀的椭圆核心组成。
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Bose-Einstein Condensation in a Gas of Sodium Atoms
We have observed Bose-Einstein condensation of sodium atoms. The atoms were trapped in a novel trap that employed both magnetic and optical forces. Evaporative cooling increased the phase-space density by 6 orders of magnitude within seven seconds. Condensates contained up to 5 3 105 atoms at densities exceeding 1014 cm23. The striking signature of Bose condensation was the sudden appearance of a bimodal velocity distribution below the critical temperature of , 2 mK. The distribution consisted of an isotropic thermal distribution and an elliptical core attributed to the expansion of a dense condensate.
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