Mobile electrons on a helium film supported by capillary action

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