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    Gilbert damping and spin Coulomb drag in a magnetized electron liquid with spin-orbit interaction

    Hankiewicz, E. M.
    Vignale, Giovanni, 1957-
    Tserkovnyak, Yaroslav
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    [PDF] GilbertDampingSpinCoulombDrag.pdf (682.7Kb)
    Date
    2007
    Format
    Article
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    Abstract
    We present a microscopic calculation of the Gilbert damping constant for the magnetization of a two-dimensional spin- polarized electron liquid in the presence of intrinsic spin-orbit interaction. First, we show that the Gilbert constant can be expressed in terms of the autocorrelation function of the spin-orbit induced torque. Then, we specialize to the case of the Rashba spin-orbit interaction and we show that the Gilbert constant in this model is related to the spin-channel conductivity. This allows us to study the Gilbert damping constant in different physical regimes, characterized by the interplay of different energy scales—spin-orbit coupling, Zeeman coupling, momentum relaxation rate, spin Coulomb drag relaxation rate, and driving frequency—and to discuss its behavior in various limits. Particular attention is paid to electron-electron interaction effects, which enter the spin conductivity and hence the Gilbert damping constant via the spin Coulomb drag coefficient.
    URI
    http://hdl.handle.net/10355/7733
    Citation
    Phys. Rev. B 75, 174434 (2007) [17 pages]
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    • Physics and Astronomy publications (MU)

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