Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.44: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

Time-resolved electron transport of surface state electrons on helium in confined geometry — •Marc Schmid and Paul Leiderer — Department of Physics, University of Konstanz, 78457 Konstanz, Germany

We report on an investigation of the transport of surface state electrons on liquid helium films in restricted geometry. For this purpose we use a source-gate-drain structure, similar to a field effect transistor, which is lithographically prepared on a silicon substrate. The electron densities on both source and drain are determined by an optical measurement of the underlying helium film, whose thickness depends on the surface charge density. For time-resolved measurements, a pulse of electrons from a small filament is first collected on the source area, and then the passage of this pulse through the channel of the split gate towards the drain is monitored. This allows to determine the electron transport of surface state electrons in channels of various dimensions and for a wide range of electron densities.