Intrinsic optical Dichroism in the 2D model of Chiral superconducting state

Abstract

Recently, we have found a new intrinsic mechanism of dichroism in chiral superconductors. It relies on the existence of many orbital character of the superconducting state as in Sr2RuO4. Using three orbital but a two-dimensional model relevant for superconducting strontium ruthenate, we calculate temperature T and frequency ω dependent ac Hall conductivity σxy(ω, T) for a number of parameters. In particular, we study the changes of σxy due to changes in the light frequency ω, spin–orbit coupling λ and effective interaction parameters Uij between electrons occupying in-plane d2g orbitals. Our calculations qualitatively agree with the measured Kerr rotation angle in Sr2RuO4 and have a potential to describe other superconductors.