Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: TR: Nanoelectronics II: Spintronics and Magnetotransport

TT 6.10: Vortrag

Montag, 22. März 2010, 16:30–16:45, H19

Suppression of the Spin-Hall Effect by Magnetic Fields in Nanostructures — •Dietrich Rothe and Ewelina M. Hankiewicz — Institut für Theoretische Physik und Astrophysik, Würzburg, Germany

The spin-Hall effect (SHE) is the generation of the transverse spin-imbalance in semiconductors with strong spin-orbit interactions in the conducting ("metallic") regime. Although the SHE is caused by spin-orbit interaction and the time symmetry breaking perturbation should destroy the phenomenon, the influence of magnetic field was not so far discussed in detail.

In this contribution, we will analyze the influence of magnetic field on the magnitude of spin signal in the H-shaped structures where the spin signal can be excited and detected electrically [1,2].

We will show, within the non-equilibrium Green function formalism, that the magnetic field destroys the spin signal effectively in perpendicular magnetic fields while the signal is much less affected in parallel fields where only the Zeeman part of the field is present. The connection with experimental results will be discussed [1].

[1] C. Bruene, A. Roth , E. G. Novik, M. Koenig, H. Buhmann, E. M. Hankiewicz, W. Hanke, J. Sinova and L. W. Molenkamp, arXiv:0812.3768 (2008).

[2] E. M. Hankiewicz, L. W. Molenkamp, T. Jungwirth, and Jairo Sinova, Phys. Rev. B 70, 241301(R) (2004).

We acknowledge financial support by DFG HA 5893/1-1.