有限数目捕获原子的玻色-爱因斯坦凝聚

衣学喜

doi:10.7498/aps.48.995

摘要

研究了各向异性谐振子捕获势中有限数目原子的玻色-爱因斯坦凝聚(BEC),结果表明：对有限数目捕获原子来说，它的BEC临界温度比热力学极限下捕获原子的BEC临界温度要低，原子间的相互作用也将提高（散射长度为负）或降低（散射长度为正）原子BEC临界温度．临界温度以下体系的比热随温度的变化行为不再是T3/2，而近似为T3．在定域密度近似下，还研究了各向同性捕获势中原子的空间分布，对有限数目的原子来说，它的密度比势力学极限下的要小，原子间的相互作用也降低原子的空间分布密度．

Abstract

The BEC in finite-number trapped atoms is investigated in this paper. The results show that the transition temperature is decreased by the finite-number effect, and the interactions between the atoms change the transition temperature, too. The specific heat below the transition point is no longer proportional to T3/2. In addition to the above effects, the distribution of the trapped atoms depend on its number. The repulsive interaction between the atoms also dilute the density of the atoms.

作者及机构信息

衣学喜

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