Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 6: Nanoelectronics III - Molecular Electronics
TT 6.8: Talk
Monday, March 26, 2007, 16:00–16:15, H19
Multishell Coulomb blockade in multiwall carbon nanotubes — •Emiliano Pallecchi1, Shidong Wang1, Csilla Miko2, Laszlo Forro2, Milena Grifoni1, and Christoph Strunk1 — 1University of Regensburg, D-93040 Regensburg, Germany — 2FBS Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
We performed low temperature measurements of magnetoconductance and non linear conductance for multiwall carbon nanotubes. Signatures of phase coherent diffusive transport are the weak localization dip and universal conductance fluctuations. At very low temperature, "anomalous" Coulomb blockade is observed: we find a superposition of several diamonds patterns in the Vsd-Ugate plane with different size. The stability diagrams are more regular than in previous studies, but qualitatively different from that observed in single wall carbon nanotubes. We attribute this behavior to the effect of the inner shells on the charging process and propose a model where the nanotube is represented by two quantum dots in parallel.