Single-particle excitations and the order parameter for a trapped superfluid Fermi gas
Single-particle excitations and the order parameter for a trapped superfluid Fermi gas
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俘获超流费米气体的单粒子激发和序参数
DOI：
10.1134/1.568187
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
M. Baranov
中科院分区：
文献类型：
--
作者：
M. Baranov
结果表明，囚禁中性原子费米气体的单粒子激发特性受到超流相变的强烈影响。在相变温度以下，空间非均匀序参数(GAP)的存在使激发本征能向上移动，并导致局域在气体样品外层的带隙内激发出现。本征能对气体温度变得敏感，不再是陷阱频率的倍数。这些特征应该表现在由陷阱频率调制引起的密度振荡的强烈变化中，并可用于识别超流相变。
It is found that the character of single-particle excitations of a trapped neutral-atom Fermi gas is strongly influenced by a superfluid phase transition. Below the transition temperature the presence of a spatially inhomogeneous order parameter (gap) shifts the excitation eigenenergies upward and leads to the appearance of in-gap excitations localized in the outer part of the gas sample. The eigenenergies become sensitive to the gas temperature and are no longer multiples of the trap frequencies. These features should manifest themselves in a strong change of the density oscillations induced by modulations of the trap frequencies and can be used for identifying the superfluid phase transition.