$^3$ He- $^4$ He稀溶液表面的反常准粒子反射
Anomalous Quasiparticle Reflection from the Surface of a $^3$He-$^4$He Dilute Solution
摘要：
稀$^3$ He- $^4$ He液体混合物的自由表面是一个独特的系统，其中两种具有不同尺寸的费米液体共存：本体中的三维（3D）$^3$ He费米液体和表面处的二维（2D）$^3$ He费米液体。为了研究两种费米液体之间相互作用产生的新效应，研究了在混合物自由表面上形成的电子维格纳晶体的迁移率。与3D和2D系统不相互作用的情况相比，观察到流动性的异常增强。这种增强被解释为三维准粒子从覆盖有二维$^3$ He系统的表面的非平凡反射。
英文摘要：
A free surface of a dilute $^3$He-$^4$He liquid mixture is a unique system where two Fermi liquids with distinct dimensions coexist: a three-dimensional (3D) $^3$He Fermi liquid in bulk and a two-dimensional (2D) $^3$He Fermi liquid at the surface. To investigate a novel effect generated by the interaction between the two Fermi liquids, mobility of a Wigner crystal of electrons formed on the free surface of the mixture is studied. An anomalous enhancement of the mobility, compared with the case where the 3D and 2D systems do not interact with each other, is observed. The enhancement is explained by non-trivial reflection of 3D quasiparticles from the surface covered with the 2D $^3$He system.
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