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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.15: Poster

Thursday, March 29, 2007, 14:00–17:45, Poster A

Influence of defects on conductance fluctuations in metallic nanowires — •Michael Wolz, Vojko Kunej, Christian Debuschewitz, and Elke Scheer — Universität Konstanz, Fachbereich Physik, Universitätsstraße 10, D-78457 Konstanz

The goal of the project is to investigate the influence of individual artificial defects on the conductance fluctuations of metallic nanowires. Clear and reproducible conductance fluctuations have been measured.

A STM working in a conventional cryostat at 4 K and in magnetic fields up to 1 T has been developed for creating the defects. In order to position the sample with respect to the STM tip the system is equiped with a x-y-table. On nanostructures which have been fabricated by electron beam lithography and reactive ion etching [1] the succsessful positioning of the stm-tip above the wire is demonstrated. The accessibility of the samples by the STM-tip is realized by shadow evaporation of the metal (Au) onto the substrate.

First low-temperature measurements with additional defects produced with the STM will be presented.

[1] T. Hoss et al., Physica E 14 (2002) 341