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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.37: Poster

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

Spin-dependent transport in carbon nanotube quantum dots — •Sonja Koller, Leonhard Mayrhofer, and Milena Grifoni — Universität Regensburg

We have theoretically studied spin-dependent transport across low transparently contacted interacting metallic single wall carbon nanotubes. The contacts are assumed to be magnetic with arbitrary magnetisation directions. In the low bias voltage regime, a current flow is either allowed by resonant tunnelling or Coulomb blocked. We could show how the current at the resonance peaks is influenced by the contact magnetisations and give the evolution of the tunnelling magnetoresistance with both the gate voltage and the relative polarisations.
In the case of exact parallel or antiparalllel polarisations, the current follows a simple analytical law. The ratio of parallel to antiparallel current merely depends on the polarisation strength and the asymmetry of the leads.