Authors: M.J. Gilbert and J.P. Bird
Affilation: Arizona State University, United States
Pages: 570 - 573
Keywords: spin filter, spin devices, split-gate technique, quantum point contact
We describe an electron filter that exploits the known transmission properties of quantum point contacts to allow local and tunable control of the spin polarization in a semiconductor. When properly configured, the conductance of this device gives a direct measure of the spin polarization of the carriers transmitted through it. These predictions are confirmed by numerical simulations, performed for a spin filter with realistic device parameters.