Quantum spin pumping with adiabatically modulated magnetic barrier's
Abstract
A quantum pump device involving magnetic barriers produced by the deposition of ferro magnetic stripes on hetero-structure's is investigated. The device for dc- transport does not provide spin-polarized currents, but in the adiabatic regime, when one modulates two independent parameters of this device, spin-up and spin-down electrons are driven in opposite directions, with the net result being that a finite net spin current is transported with negligible charge current. We also analyze our proposed device for inelastic-scattering and spin-orbit scattering. Strong spin-orbit scattering and more so inelastic scattering have a somewhat detrimental effect on spin/charge ratio especially in the strong pumping regime. Further we show our pump to be almost noiseless, implying an optimal quantum spin pump.
Keywords
Cite
@article{arxiv.quant-ph/0303176,
title = {Quantum spin pumping with adiabatically modulated magnetic barrier's},
author = {Ronald Benjamin and Colin Benjamin},
journal= {arXiv preprint arXiv:quant-ph/0303176},
year = {2007}
}
Comments
14 pages, 9 figures. Manuscript revised with additional new material on spin-orbit scattering and inelastic scattering. Further new additions on noiseless pumping and analytical results with distinction between weak and strong pumping regimes. Accepted for publication in Physical Review B