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First- and second-sound-like modes at finite temperature in trapped Fermi gases from BCS to BEC

机译:从BCS到BEC的有限费米气体中在有限温度下的第一和第二声音模式

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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-c.
机译:我们确定经历BCS到Bose-Einstein凝聚(BEC)穿越的捕获费米气体的第一和第二声音模式频率的温度(T)依赖性。我们的结果基于两流体方程的数值解以及热力学变量的微观计算。如在实验中和在整体性上,我们表明最低的径向呼吸模式与T无关。在有限的T下,高阶呼吸模式会与第二声音强烈混合。它们对T的复杂依赖性将为测量转变温度T-c提供另一种方法。

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