project title: Carbon Nanotube/Metal Hybrid Structures at mK-temperatures
project leader: Prof. Christoph Strunk
access given (in days): 123
access used (in days): 128
local host: Prof. Pertti Hakonen
home institution: Institut für Experimentelle und Angewandte Physik, Universität Regensburg
country of institution: Germany
starting date (yyyy-mm-dd): 2004-04-15
Professor Cristopher Strunk is from University of Regensburg, Germany. His project is directed towards the investigation of quantum transport in carbon nanotubes. Individual multi- and single walled nanotubes will be contacted electrically and investiged at very low temperatures, available at the Low Temperature Laboratory. Special emphasis is given to the interplay between Coulomb blockade and quantum interference. The usability of individual carbon nanotubes for ultrasensitve charge detection in rf-SET schemes will be tested.
Lorenz Lechner, a graduate student of Professor Strunk has visited the LTL for 4 months and the first results on proximity-effect-induced superconductivity have been obtained in multiwalled samples made out of plasma-enhanced CVD nanotubes. This is the first time ever when proximity-effect-induced superconductivity has been observed in multiwalled nanotubes! The observed superconductivity depends strongly on the gate-induced doping of the number of charge carriers in the tube. The products of critical current times the normal state resistance is found to be much lower than predicted for regular, metallic SNS junctions. The results are still unpublished. Publications are under preparation.