Anomalous Quasiparticle Reflection from the Surface of a 3He-4He Dilute Solution
Abstract
A free surface of a dilute 3He-4He liquid mixture is a unique system where two Fermi liquids with distinct dimensions coexist: a three-dimensional (3D) 3He Fermi liquid in bulk and a two-dimensional (2D) 3He 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 3He system.
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