Björn Sothmann, Jürgen König, Anatoli Kadigrobov
Published 2010-08-05, updated 2010-11-12Version 2
We study the influence of spin waves on transport through a single-level quantum dot weakly coupled to ferromagnetic electrodes with noncollinear magnetizations. Side peaks appear in the differential conductance due to emission and absorption of spin waves. We, furthermore, investigate the nonequilibrium magnon distributions generated in the source and drain lead. In addition, we show how magnon-assisted tunneling can generate a fullly spin-polarized current without an applied transport voltage. We discuss the influence of spin waves on the current noise. Finally, we show how the magnonic contributions to the exchange field can be detected in the finite-frequency Fano factor.
Comments: published version, 15 pages, 10 figures
Journal: Phys. Rev. B 82, 205314 (2010)
The theory of magneto-transport in quantum dots: 3D-0D and 2D-0D tunnelling and selection rules for the angular momentum
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Resonant tunneling through a quantum dot weakly coupled to quantum wires or quantum Hall edge states
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