Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Transport: Fluctuations and Noise
TT 3.4: Vortrag
Montag, 25. Februar 2008, 10:15–10:30, H 2053
Full counting statistics of electronic transport through quantum-dot spin valves — •Stephan Lindebaum, Daniel Urban, and Jürgen König — Institut für Theoretische Physik III, Ruhr-Universität Bochum
We study the full counting statistics of electronic transport through a quantum dot weakly coupled to two ferromagnetic leads with noncollinear polarization directions. It is possible to generate a nonequilibrium spin accumulation on the dot which affects the spin valve characteristics of transport1.
To investigate the system we perform a perturbative analysis of the transport properties to first order in the tunnel-coupling strength. A diagrammatic real-time transport theory enables us to calculate the cumulant generating function starting from a generalized master equation2.
A comparision of the cumulants’ dependence on the angle enclosed by the magnetizations reveals notable differences between the interacting and non-interacting case.
[1] M. Braun, J. König, and J. Martinek, Phys. Rev. B 70, 195345 (2004).
[2] A. Braggio, J. König, and R. Fazio, Phys. Rev. Lett. 96, 026805 (2006).