Parametric quantum spin pump
Wei Zheng, Junling Wu, Baigeng Wang, Jian Wang, Qingfeng Sun, and Hong, Guo

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.
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