Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Postersession Transport: Nanoelectronics, Quantum Coherence and Quantum Information, Fluctuations and Noise
TT 35.20: Poster
Mittwoch, 25. März 2009, 14:00–18:00, P1A
Formation of low conductive constrictions in nanostructures by electromigration — •Birgit Kießig1,2, Wanyin Cui1,2, Kai Grube1, Regina Hoffmann2, and Roland Schäfer1 — 1Forschungszentrum Karlsruhe, IFP, Postfach 3640, 76021 Karlsruhe — 2Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe
Exposure of metallic nanostructures to high currents leads to deterioration by
melting or electromigration.
Ref. 1 describes a method how to use the latter in a controlled way to form
constrictions with conductances down to the conductance quantum G0=2e2/h.
Below several G0 conductance prefers to stabilize at material dependent values well known from conductance quantization experiments.
We apply the method described in Ref. 1 to different
materials and extend it to nanostructures containing rings. The rings are
connected to two leads at opposite sides and the electromigration-controlled
constriction formation acts in a balanced way in both ring arms.
[1] R. Hoffmann, D. Weissenberger, J. Hawecker, and D. Stöffler, Appl. Phys. Lett. 93, 0431118 (2008).