Kerr effect from diffractive skew scattering in chiral $p_x\pm i{p}_y$ superconductors

Abstract

We calculate the temperature dependent anomalous ac Hall conductance ${\sigma }_H(\Omega ,T)$ for a two-dimensional chiral p-wave superconductor. This quantity determines the polar Kerr effect, as it was observed in Sr${}_2$RuO${}_4$ [J. Xia $et$ $al.$, Phys. Rev. Lett. 97, 167002 (2006)]. We concentrate on a single band model with arbitrary isotropic dispersion relation subjected to rare, weak impurities treated in the Born approximation. As we explicitly show by detailed computation, previously omitted contributions to extrinsic part of an anomalous Hall response, physically originating from diffractive skew scattering on quantum impurity complexes, appear to the leading order in impurity concentration. By direct comparison with published results from the literature we demonstrate the relevance of our findings for the interpretation of the Kerr effect measurements in superconductors.

arXiv comment5 pages, 2 figures; Supplementary material included

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• Universal classes of disorder scatterings in in-plane anomalous Hall effect
• Influence of Fermi Surface Geometry and Van Hove Singularities on the Optical Response of Sr${}_2$RuO${}_4$