First-and second-sound-like modes at finite temperature in trapped Fermi gases from BCS to BEC
First-and second-sound-like modes at finite temperature in trapped Fermi gases from BCS to BEC
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DOI：
10.1103/physreva.76.051602
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发表时间：
2007-04
影响因子：
2.9
通讯作者：
Yan He;C. Chien;Qijin Chen;K. Levin
中科院分区：
文献类型：
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作者：
Yan He;C. Chien;Qijin Chen;K. Levin
我们确定了经历BCS到玻色-爱因斯坦凝聚（BEC）交叉的捕获费米气体的第一和第二类声音模式频率的温度(T)依赖性。我们的结果是基于两流体方程的数值解和热力学变量的微观计算。在实验中，我们证明了最低径向呼吸模式是与T无关的。在有限T时，高阶呼吸模式与第二声强烈混合。它们的复T依赖性应该提供另一种测量转变温度T{下标c}的方法。
We determine the temperature (T) dependence of first- and second-sound-like mode frequencies for trapped Fermi gases undergoing the BCS to Bose-Einstein condensation (BEC) crossover. Our results are based on numerical solution of the two-fluid equations in conjunction with a microscopic calculation of thermodynamical variables. As in experiment and at unitarity, we show that the lowest radial breathing mode is T independent. At finite T, higher-order breathing modes strongly mix with second sound. Their complex T dependence should provide an alternative way of measuring the transition temperature T{sub c}.