Spin polarization in a T-shape conductor induced by strong Rashba spin-orbit coupling

Details Spin polarization in a T-shape conductor induced by strong Rashba spin-orbit coupling Spin polarization in a T-shape conductor induced by strong Rashba spin-orbit coupling

2005-02-24

arxiv.org/abs/cond-mat/0502572v2

Phys. Rev. B 72, 115321 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.72.115321

We investigate numerically the spin polarization of the current in the presence of Rashba spin-orbit interaction in a T-shaped conductor proposed by A.A. Kiselev and K.W. Kim (Appl. Phys. Lett. {\bf 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 $e^{2}/h$ for sufficiently strong spin-orbit coupling. This is interpreted by the fact that electrons with opposite spin states are deflected into an opposite terminal by the spin dependent Lorentz force. The influence of the disorder on the predicted effect is also discussed. Cases for multi-channel transport are studied in connection with experiments.

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