Diffusion equation and spin drag in spin-polarized transport

Karsten Flensberg, Thomas Stibius Jensen, Asger Mortensen

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    Abstract

    We study the role of electron-electron interactions for spin-polarized transport using the Boltzmann equation, and derive a set of coupled transport equations. For spin-polarized transport the electron-electron interactions are important, because they tend to equilibrate the momentum of the two-spin species. This "spin drag" effect enhances the resistivity of the system. The enhancement is stronger the lower the dimension is, and should be measurable in, for example, a two-dimensional electron gas with ferromagnetic contacts. We also include spin-flip scattering, which has two effects: it equilibrates the spin density imbalance and, provided it has a non-s-wave component, also a current imbalance.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume64
    Issue number24
    Pages (from-to)245308
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2001

    Bibliographical note

    Copyright (2001) American Physical Society

    Keywords

    • SYSTEMS
    • MAGNETORESISTANCE
    • COULOMB DRAG

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