AC-driven double quantum dots as spin pumps and spin filters

TL;DR

This paper proposes a method using ac-driven double quantum dots to achieve controllable spin filtering and pumping, analyzing how parameters influence spin polarization and considering decoherence effects.

Contribution

It introduces a novel scheme for spin control in quantum dots using ac fields, with detailed analysis of current polarization and decoherence impacts.

Findings

Spin polarization can be tuned by adjusting ac field parameters.

The scheme enables effective spin filtering and pumping.

Decoherence effects influence the pumped current stability.

Abstract

We propose and analyze a new scheme of realizing both spin filtering and spin pumping by using ac-driven double quantum dots in the Coulomb blockade regime. By calculating the current through the system we demonstrate that the spin polarization of the current can be controlled by tuning the parameters (amplitude and frequency) of the ac field. We also discuss spin relaxation and decoherence effects in the pumped current.