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Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.11: Poster

Friday, March 4, 2005, 16:30–19:00, Poster TU E

Spin polarization in a T-shape conductor induced by strong Rashba spin-orbit coupling — •Masayuki Yamamoto1, Tomi Ohtsuki2, and Bernhard Kramer11I.Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany — 2Department of Physics, Sophia University, Kioi-cho 7-1, Chiyoda-ku, Tokyo 102-8554, Japan

We investigate numerically the spin polarization of the current in the presence of Rashba spin-orbit interaction in a T-shaped conductor as proposed by A.A. Kiselev and K.W. Kim (Appl. Phys. Lett. 78 775 (2001)). The recursive Green function method is used to calculate the three terminal spin dependent transmission probabilities. We focus on single-channel transport and show that the spin polarization becomes nearly 100 % with a conductance close to e2/h for sufficiently strong spin-orbit coupling. From the quantum dynamics of wave packets, we deduce that this is due to spin separation caused by quantum mechanical scattering at the junction. The influence of the disorder on the predicted effect is discussed.

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