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arXiv 2403.05057cond-mat.quant-gascond-mat.stat-mech
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零温三维费米气体中的杂质

Impurity in a zero-temperature three-dimensional Fermi gas

P. L. Krapivsky

AI总结:

本文研究零温均匀费米气体中杂质的动量弛豫与标度分布,三维求解 Lorentz-Boltzmann 方程得到合流超几何函数解,并给出二维情形的大小动量渐近预测。

摘要:

我们考虑一个处于零温费米子海中的杂质,这些费米子均匀分布在整个空间中。杂质在费米子上发生散射。平均而言,杂质的动量在 d 维中随时间按 t^{-1/(d+1)} 衰减,并且动量分布在长时间极限下呈现标度形式。我们在三维中求解了关于杂质标度动量分布的 Lorentz-Boltzmann 方程。该解是合流超几何函数的组合。在两个空间维度中,Lorentz-Boltzmann 方程无法解析求解,因此我们仅提取了一些关于杂质标度动量较小或较大时渐近行为的精确预测。

英文摘要:

We consider an impurity in a sea of zero-temperature fermions uniformly distributed throughout the space. The impurity scatters on fermions. On average, the momentum of impurity decreases with time as $t^{-1/(d+1)}$ in $d$ dimensions, and the momentum distribution acquires a scaling form in the long time limit. We solve the Lorentz-Boltzmann equation for the scaled momentum distribution of the impurity in three dimensions. The solution is a combination of confluent hypergeometric functions. In two spatial dimensions, the Lorentz-Boltzmann equation is analytically intractable, so we merely extract a few exact predictions about asymptotic behaviors when the scaled momentum of the impurity is small or large.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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