Low Temperature Physics: 24, 119 (1998); https://doi.org/10.1063/1.593553 (2 pages)
Fizika Nizkikh Temperatur: Volume 24, Number 2 (February 1998), p. 163-165 ( to contents , go back )
Mapping of 2D contact perturbations by electrons on a helium film
E. Teske, P. Wyder
Grenoble High Magnetic Field Laboratory, Max-Plank Institut fur Festkorperforschung Centre National de la Recherche Scientifique, B.P.166, F-38042, Grenoble, Cedex 9, France
Fakultet fur Physik, Universitet Konstanz, D-78434 Konstanz, Germany
Institute of Solid State Physics, 142432 Chernogolovka, Moscow District, Russia
A promising way to investigate 2D contact phenomena is proposed. This method is based on the idea of depositing surface state electrons (SSE) on a thin layer of liquid helium covering the surface of a solid sample containing a 2D charge carrier system. The density of SSE adjusts to screen contact-induced perturbations of the electrostatic potential across the sample. As a result, the helium layer thickness varies due to the variation of the electrostatic pressure, thus providing a map. This map may be read off interferometrically by a technique already employed for the investigation of multi-electron dimples on helium. We have realized this mapping for a structured electrode as a test sample to demonstrate the resolution of the method.