Results from FOPI on Λ production in Ni+Ni collisions at 1.93 A GeV
Results from FOPI on Λ production in Ni+Ni collisions at 1.93 A GeV
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FOPI 对 1.93 A GeV Ni+Ni 碰撞中 Λ 产生的结果
DOI：
10.1016/j.ppnp.2004.02.007
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发表时间：
2004
影响因子：
9.6
通讯作者：
X. Lopez
中科院分区：
文献类型：
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作者：
X. Lopez
在这篇简短的综述中，我们介绍了我们关于二次势或四次势中原子玻色-爱因斯坦凝聚体转动的最新结果，并对这一领域进行了概述。我们首先描述了使原子气体旋转的过程，并简要讨论了含有一条涡旋线的凝聚体的物理学。然后，我们讨论了谐波陷阱中的快速旋转区域，其中旋转频率接近于陷阱频率。在这个极限下，朗道能级形式主义非常适合描述这个系统。讨论了快速旋转气体的凝结温度问题，以及云的平衡形状和涡旋格子的结构。最后，我们回顾了用二次+四次势得到的结果，它允许研究旋转频率等于或大于谐波俘获频率的区域。
In this short review we present our recent results concerning the rotation of atomic Bose-Einstein condensates confined in quadratic or quartic potentials, and give an overview of the field. We first describe the procedure used to set an atomic gas in rotation and briefly discuss the physics of condensates containing a single vortex line. We then address the regime of fast rotation in harmonic traps, where the rotation frequency is close to the trapping frequency. In this limit the Landau Level formalism is well suited to describe the system. The problem of the condensation temperature of a fast rotating gas is discussed, as well as the equilibrium shape of the cloud and the structure of the vortex lattice. Finally we review results obtained with a quadratic + quartic potential, which allows to study a regime where the rotation frequency is equal to or larger than the harmonic trapping frequency.