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arXiv 0709.0698cond-mat.other
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在么正性条件下探讨囚禁费米超流体中的双流体动力学

Probing two-fluid hydrodynamics in a trapped Fermi superfluid at unitarity

Edward Taylor, Hui Hu, Xia-Ji Liu, Allan Griffin

摘要:

我们发展了一种变分方法来计算有限温度下接近于费什巴赫共振的双组分费米超流体中最低两流体模的密度响应函数。这种异相振荡类似于均匀超流体中第二声在囚禁气体中的振荡,但迄今为止还没有在冷原子实验中观察到。在么正性下,我们证明了这些模式在有限温度下通过双光子布拉格散射是可观测的,其光谱与密度响应函数的虚部有关。这为超流性提供了直接证据,也为检验么正态下热力学的微观结果提供了一种有前途的方法。

英文摘要:

We develop a variational approach to calculate the density response function at finite temperatures of the lowest-lying two-fluid modes in a trapped two-component Fermi superfluid close to a Feshbach resonance. The out-of-phase oscillations, which are the analogue in trapped gases of second sound in uniform superfluids, have so far not been observed in cold-atom experiments. At unitarity, we show that these modes are observable at finite temperatures via two-photon Bragg scattering, whose spectrum is related to the imaginary part of density response function. This provides direct evidence for superfluidity and a promising way to test microscopic results for thermodynamics at unitarity.

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