Enhancement of Spin-charge Conversion in Dilute Magnetic Alloys by Strong Electronic Correlations

Physical Review Letters (submitted), (2020)

Enhancement of Spin-charge Conversion in Dilute Magnetic Alloys by Strong Electronic Correlations

C. Huang, I. V. Tokatly, M. A. Cazalilla

We derive a kinetic theory capable of dealing both with strong correlations and large spin-orbit coupling in dilute magnetic alloys. We obtain the quantum collision integral non-perturbatively and uncover a contribution proportional to the momentum derivative of the impurity scattering S-matrix. The latter yields an important correction to the spin diffusion and spin-charge conversion coefficients when both electronic correlations and spin-orbit coupling are strong, and fully captures the so-called side-jump process without resorting to the Born approximation (which fails for resonant scattering) or to otherwise heuristic derivations. As an illustration of our theory, we study a model of a strongly spin-orbit coupled magnetic impurity and find 1) a giant zero-temperature spin Hall conductivity that depends solely on the Fermi energy and 2) a transverse spin diffusion mechanism that modifies the standard Fick's diffusion law. Our predictions can be readily verified by measuring the longitudinal and transverse spin diffusion coefficients in dilute magnetic alloys.

Additional Information

arxiv
http://arxiv.org/abs/2008.10185

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