Parametric quantum spin pump

TL;DR

This paper proposes a non-adiabatic quantum spin pump utilizing ferromagnetic leads to generate pure spin currents without charge flow, advancing spintronics technology.

Contribution

It introduces a novel non-adiabatic spin pump design that exploits spin-dependent potentials in ferromagnetic leads for pure spin current generation.

Findings

The spin pump can produce spin currents with negligible charge current.

The device operates via non-adiabatic modulation of spin-dependent potentials.

Potential applications in spintronics and quantum information processing.

Abstract

We investigate a non-adiabatic parametric quantum pump consists of a nonmagnetic scattering region connected by two ferromagnetic leads. The presence of ferromagnetic leads allows electrons with different spins to experience different potential landscape. Using this effect we propose a quantum spin pump that drives spin-up electrons to flow in one direction and spin-down electrons to flow in opposite direction. As a result, the spin pump can deliver a spin current with vanishing charge current.