T-shaped spin filter with a ring resonator

TL;DR

This paper predicts a planar ballistic device that effectively filters electron spins into two outputs with opposite polarizations, leveraging spin-dependent transmission and phase differences in a ring resonator with Rashba spin-orbit interaction.

Contribution

It introduces a novel T-shaped spin filter design utilizing ring resonator and Rashba interaction for high-efficiency spin polarization separation.

Findings

Effective spin filtering into opposite polarizations

Utilizes spin-dependent transmission properties

Operates with high purity of spin polarization

Abstract

A planar ballistic structure is predicted to be highly effective in filtering electron spin from an unpolarized source into two output fluxes with the opposite and practically pure spin polarizations. The operability of the proposed device relies on the peculiar spin-dependent transmission properties of the T-shaped connector in the presence of the Rashba spin-orbit interaction as well as the difference in the dynamic phase gains of the two alternative paths around the ring resonator through upper and lower branches for even and odd eigenmodes.