Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 6: Quantum dots and wires: Transport properties I
HL 6.7: Vortrag
Montag, 27. März 2006, 11:45–12:00, BEY 118
Conductance and frequency dependent noise of a quantum dot spin valve — •Matthias Braun1, Jürgen König1, and Jan Martinek2 — 1Theoretische Physik III, Ruhr-Universit"at Bochum, D-44780 Bochum — 2Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznań, Poland
We discuss the transport properties of a single-level quantum dot weakly coupled to ferromagnetic leads with non-collinear magnetizations. The conductance of such a device directly depends on the non-equilibrium spin on the quantum dot [1]. The dot spin undergoes an interaction induced intrinsic spin precession [2], which can suppress magnetoresistance and can lead to a negative differential conductance. Spin relaxation can be addressed by an all electrical Hanle setup [3]. While the conductance is sensitive to the time average dot spin only, the time dependent spin dynamics can be observed in the current-current correlation function.
[1] M. Braun, J. König, and J. Martinek, PRB 70, 195345 (2004)
[2] J. König and J. Martinek, PRL 90, 166602 (2003)
[3] M. Braun, J. König, and J. Martinek, EPL 72, 294 (2005)