Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 33: Spin-dependent Transport I

HL 33.3: Talk

Tuesday, March 15, 2011, 10:45–11:00, POT 251

Influence of in-plane magnetic fields on the spin-orbit coupling in InAs spin-filter cascades — •Hauke Lehmann, Till Benter, Alexander Buhr, and Jan Jacob — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg.

In Y-shaped three-terminal junctions of quasi one-dimensional nano-wires fabricated from InAs heterostructures an unpolarized current is separated into two oppositely polarized currents by the intrinsic spin Hall effect. The spin polarization can be detected by a second filter stage [1]. Combining the intrinsic spin Hall effect with the spin precession, originating from the spin-orbit interaction, the electrons execute an oscillatory motion - the so-called zitterbewegung. This motion can be tuned by an in-plane magnetic field perpendicular to the electrons’ direction of motion, which couples to the effective Rashba field. We present DC biased lock-in transport measurements at millikelvin temperatures on two-staged spin-filter cascades and compare them to simulations [2].

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

[2] P. Brusheim and H. Q. Xu, arXiv: 0810.2186v2 (2009).