Single-particle excitations and the order parameter for a trapped superfluid Fermi gas

被引:24
作者
Baranov, MA [1 ]
机构
[1] Russian Res Ctr, Kurchatov Inst, Moscow 123182, Russia
关键词
D O I
10.1134/1.568187
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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. (C) 1999 American Institute of Physics. [S0021-3640(99)00618-0].
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页码:396 / 402
页数:7
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