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Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 27: Nanoelektronik III: Molekulare Elektronik

TT 27.9: Talk

Thursday, March 11, 2004, 12:00–12:15, H19

Parallel and Perpendicular Magnetoresistance of Multiwall Carbon Nanotubes — •Bernhard Stojetz1, Christoph Hendlmeier1, Christian Hagen1, Edina Ljubović2, Lazlo Forró2, and Christoph Strunk11Institut für Experimentelle und Angewandte Physik, Universität Regensburg — 2Institute of Physics of Complex Matter, FBS Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland

We report resistance measurements for single multiwall carbon nanotubes in magnetic fields both parallel and perpendicular to the tube axis. The tubes were trapped onto pre-patterned Al gate electrodes by means of an ac electric field. The strong electrostatic coupling of the nanotube to the gate allows a considerable variation of the doping level of the tube. Magnetoresistance traces were measured for many values of the gate voltage, which allows an ensemble averaging of the conductance fluctuations induced by quantum interference. The ensemble averaging reduces the conductance fluctuations while leaving the weak localization contribution to the resistance unchanged. The data can be consistently interpreted in terms of quantum transport in presence of weak disorder.

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