Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.63: Poster
Wednesday, March 24, 2010, 17:45–20:30, Poster B1
Transport-measurements of electro-chemically fabricated metallic contacts under laser illumination — •Bastian Kopp1, Markus Schmotz1, Daniel Benner1, Christian Obermair2, Fangqing Xie2, Thomas Schimmel2, Paul Leiderer1, and Elke Scheer1 — 1Universität Konstanz — 2Universität Karlsruhe
Aim of this work is to study the effects of laser illumination on metallic point contacts. So far lithographically fabricated Mechanically Controllable Breakjunctions (MCBs) [E. Scheer, Phys. Rev. Lett. 78, 3535 (1997)] as well as Gate-Controlled Atomic Quantum Switches (GQS) [F.-Q. Xie, Phys. Rev. Lett. 93, 128303 (2004)] were used to create atomic point-contacts. MCBs operate at ambient conditions whereas GQS use the electrochemical deposition and dissolution of metal atoms to create these contacts.
Previous work on illumination effects on MCBs showed dependences on the wavelength, the position, the size of the contacts [D. C. Guhr, Phys. Rev. Lett. 99, 086801 (2007)] and the optical properties of the substrate material [unpublished]. The latter result points to the possible influence of thermal expansion besides the photo-assisted transport due to the excitation of high-energy quasiparticles [J.K. Viljas, Phys. Rev. B 75, 075406 (2007)] and the excitation of surface plasmons.
In order to minimize the influence of thermal expansion we now investigate the effect of light on GQS. We will present first results obtained under light irradiation on GQS and discuss possible mechanisms including photochemical reactions.