Dresden 2011 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Spin-dependent Transport I

HL 33.2: Vortrag

Dienstag, 15. März 2011, 10:30–10:45, POT 251

InAs spin-filter cascades in perpendicular magnetic fields — •Hauke Lehmann, Till Benter, Jan Jacob, and Ulrich Merkt — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg

We have experimentally demonstrated the generation and detection of spin-polarized currents by the intrinsic spin Hall effect in two-staged spin-filter cascades fabricated from InAs heterostructures [1]. Applying an external magnetic field perpendicular to the two-dimensional electron system introduces a Lorentz force. This adds to the spin-dependent force of the intrinsic spin Hall effect a spin-independent force dragging the electrons into one of the two outputs of each filter. Thus the magnetic field leads to a change of conductances and spin polarizations in each output. The conductances at the filters’ outputs depend on the magnetic field direction and strength. Thus the application of magnetic fields allows inference on the strength of the intrinsic spin Hall effect in low-dimensional semiconductor nanostructures.

[1] J. Jacob, G. Meier, S. Peters, T. Matsuyama, U. Merkt, A. Cummings, R. Akis, and D. Ferry. J. Appl. Phys. 105, 093714 (2009).