Bose-Einstein condensation in trapped atomic gases.
Bose-Einstein condensation in trapped atomic gases.
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DOI：
10.1103/physrevlett.76.2670
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发表时间：
1996-04
影响因子：
8.6
通讯作者：
Kagan;Shlyapnikov;Walraven
中科院分区：
文献类型：
--
作者：
Kagan;Shlyapnikov;Walraven
我们讨论了被捕获原子气体中的玻色-爱因斯坦凝聚，并分析了散射长度a的符号和粒子间相互作用与阱中能级间距的比值\ensuremath{\eta}如何影响凝聚波函数${\ensuremath{\psi}}_{0}$的行为。我们发现对于$al0$和$\ensuremath{\eta}\ensuremath{\ll}1$，有可能形成一个亚稳态玻色凝聚体，在粒子的收缩和跃迁到激发态方面具有很长的特征寿命。对于$\ensuremath{\eta}\ensuremath{\gg}1$，负散射长度阻止凝聚物的形成。如果$ag0$，则密度的增加伴随着${\ensuremath{\psi}}_{0}$向较宽的准均匀分布演化。
We discuss Bose-Einstein condensation in a trapped atomic gas and analyze how the sign of the scattering length a and the ratio \ensuremath{\eta} of the interaction between particles to the level spacing in the trap influence the behavior of the condensate wave function ${\ensuremath{\psi}}_{0}$. We find that for $al0$ and $\ensuremath{\eta}\ensuremath{\ll}1$ it is possible to form a metastable Bose condensate, with a long characteristic lifetime with respect to contraction and transitions of particles to excited trap states. For $\ensuremath{\eta}\ensuremath{\gg}1$ a negative scattering length prevents the formation of the condensate. If $ag0$, then an increase of density is accompanied by the evolution of ${\ensuremath{\psi}}_{0}$ to a comparatively wide quasihomogeneous distribution.