MOBILE ELECTRONS ON A HELIUM FILM SUPPORTED BY CAPILLARY ACTION

A thick film of liquid He-4 is suspended by the effect of capillary ac tion on an array of small discs. A two-dimensional electron system (2D ES) has been realized on this film. Using standard low-frequency imped ance measurements it could be established that the electrons remain mo bile when passing from the regime of a bulk liquid to a suspended film . Using these techniques allows the investigation of a new class of lo w-dimensional electron systems.