3He Impurities in 4He Systems Adsorbed on Curved Substrates

Abstract

It is shown that 3He impurities in sufficiently large 4He systems adsorbed onto substrates with curved geometries form surface bound states, analogous to the Andreev state on a planar liquid-vapor interface. We report the analysis performed for superfluid 4He adsorbed on the external surface of the nano-fullerene C60 and on cylindrical nano-wires of Au. It is found that a single 3He impurity diluted into such adsorbed structures behaves as on films on planar substrates and as on pure 4He clusters.