We propose a two-terminal spin filter utilizing a quantum dot with spin-orbit interaction and magnetic field. First we examine a quantum dot with two energy-levels, as a minimal model, and obtain an analytical expression for the spin-dependent conductance. When the spacing between the two levels is smaller than the level broadening due to the tunnel coupling to the leads, a largely spin-polarized current is generated around the current peaks of Coulomb oscillation. Next, we perform a numerical simulation using a realistic model for a quantum dot and tunnel barriers and evaluate the efficiency of our spin filter.
|Journal of Physics: Conference Series
|Published - 2012
|26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China
Duration: 2011 Aug 10 → 2011 Aug 17
ASJC Scopus subject areas
- General Physics and Astronomy