费米混合物中自旋和质量不平衡对Anderson-Bogolyubov模的阻尼
Damping of the Anderson-Bogolyubov mode by spin and mass imbalance in Fermi mixtures
摘要：
我们研究了自旋和质量不平衡费米混合物对涨落传播子梯度展开的时间非局域贡献。这些条款是有关的声音（安德森-Bogolyubov）集体模式的阻尼过程和相关的对波动传播子的复极点的结构。我们推导出的条件下，即使在零温度下的费米面足够大的失配发生阻尼。我们比较我们的分析结果与数值计算的Anderson-Bogolyubov模式的阻尼率。
英文摘要：
We study the temporally nonlocal contributions to the gradient expansion of the pair fluctuation propagator for spin- and mass-imbalanced Fermi mixtures. These terms are related to damping processes of sound-like (Anderson-Bogolyubov) collective modes and are relevant for the structure of the complex pole of the pair fluctuation propagator. We derive conditions under which damping occurs even at zero temperature for large enough mismatch of the Fermi surfaces. We compare our analytical results with numerically computed damping rates of the Anderson-Bogolyubov mode.
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