Quantum spin pumping with adiabatically modulated magnetic barrier's
arXiv:quant-ph/0303176 · doi:10.1103/PhysRevB.69.085318
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.
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
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- Theory of Non-Coherent Spin Pumps
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- Detecting a true quantum pump effect
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- The influence of spin-flip scattering on the preparation and detection of a single spin state in a quantum dot attached to a spin battery