The spin transport characteristics of a nanowire directional electronic coupler have been evaluated theoretically via a transfer matrix approach. The application of a gate field in the region of mixing allows for control of spin current through the different leads of the coupler via the Rashba spin-orbit interaction. The combination of spin-orbit interaction and applied gate voltages on different legs of the coupler give rise to a controllable modulation of the spin polarization. Both structural factors and field strength tuning lead to a rich phenomenology that could be exploited in spintronic devices.
@article{arxiv.1308.1882,
title = {Spin filtering in nanowire directional coupler},
author = {M. Rebello Sousa Dias and V. Lopez-Richard and G. E. Marques and S. E. Ulloa},
journal= {arXiv preprint arXiv:1308.1882},
year = {2015}
}