Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Poster Session Transport & Matter at Low Temperature

TT 58.10: Poster

Donnerstag, 14. März 2013, 15:00–19:00, Poster D

Fabrication of Au atomic sized contacts and conductivity measurements — •Karthiga Kanthasamy, Christoph Tegenkamp, and Herbert Pfnür — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, 30167 Hannover, Germany

Mechanically controllable break junctions offers an inherent stability and repeatability to contact a single atom and measure its electrical properties. We describe the fabrication of Au contacts on thin silicon substrate. Shadow mask technique, Electron Beam lithography and Thermal evaporation are used to fabricate Au contacts. The undercut is done by Reactive Ion Etching and Chemical Etching. The comparison of electrical conductance on Silicon substrate with different etching methods are discussed. Stepwise changes in the conductance measurements are observed for both room and low temperature and conductance histogram graph is studied.