Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.11: Poster

Freitag, 4. März 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 Kramer¹ — ¹I.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.