Spin-filtering by field dependent resonant tunneling

TL;DR

This paper theoretically investigates spin-polarized transport in a quantum wire with impurities under magnetic fields, showing conditions for achieving complete spin polarization at low temperatures.

Contribution

It introduces a model for spin filtering via resonant tunneling in an interacting quantum wire with impurities, highlighting tunable spin polarization.

Findings

Spin-polarized current occurs at specific parameter points.

Complete spin polarization possible at low temperatures.

Interaction strength influences polarization efficiency.

Abstract

We consider theoretically transport in a spinfull one-channel interacting quantum wire placed in an external magnetic field. For the case of two point-like impurities embedded in the wire, under a small voltage bias the spin-polarized current occurs at special points in the parameter space, tunable by a single parameter. At sufficiently low temperatures complete spin-polarization may be achieved, provided repulsive interaction between electrons is not too strong.