Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 49: Spinabh
ängiger Transport III

HL 49.4: Talk

Friday, March 12, 2004, 11:45–12:00, H13

Positive cross correlations in a three-terminal quantum dot with ferromagnetic contacts — •Wolfgang Belzig, Audrey Cottet, and Christoph Bruder — Department für Physik, Universität Basel, Klingelbergstr. 82, 4056 Basel, Schweiz

We study current fluctuations in a three-terminal quantum dot with ferromagnetic leads in the sequential tunneling regime. Dynamical spin blockade on the dot leads to positive zero-frequency cross-correlations of the currents in the output leads. We include the influence of spin-flip scattering and identify favorable conditions for the experimental observation of this effect with respect to polarization of the contacts and tunneling rates.