费米液体理论应用于3 He-4 He混合物的振弦测量
Fermi liquid theory applied to vibrating wire measurements in 3He-4He mixtures
摘要：
本文用费米液体理论研究了3 He-4 He混合气体在低温下的机械阻抗。该理论适用于振动线的情况下，浸在液体中。本文基于Landau-Boltzmann方程直接求解，在准粒子平均自由程全尺度下，考虑了混合物的双流体性质，详细研究了费米液体相互作用和边界条件对3 He准粒子分布的影响。计算结果与实验数据吻合较好。特别是，我们可以重现惯性的异常下降，在振动线实验达到弹道极限。实验容器和第二声共振的本质效果被证明。
英文摘要：
We use Fermi liquid theory to study the mechanical impedance of 3He-4He mixtures at low temperatures. The theory is applied to the case of vibrating wires, immersed in the liquid. We present numerical results based on a direct solution of Landau-Boltzmann equation for the 3He quasiparticle distribution for the full scale of the quasiparticle mean-free-path. The two-fluid nature of mixtures is taken into account in the theory, and the effect of Fermi liquid interactions and boundary conditions are studied in detail. The results are in fair quantitative agreement with experimental data. In particular, we can reproduce the anomalous decrease in inertia, observed in vibrating wire experiments reaching the ballistic limit. The essential effect of the experimental container and second-sound resonances is demonstrated.
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