Anomalous Quasiparticle Reflection from the Surface of a He-3-He-4 Dilute Solution

Abstract

A free surface of a dilute He-3-He-4 liquid mixture is a unique system where two Fermi liquids with distinct dimensions coexist: a three-dimensional (3D) He-3 Fermi liquid in the bulk and a two-dimensional (2D) He-3 Fermi liquid at the surface. To investigate a novel effect generated by the interaction between the two Fermi liquids, the 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 the nontrivial reflection of 3D quasiparticles from the surface covered with the 2D He-3 system.