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.
Highlights
The understanding of the many puzzling properties of Sr2RuO4 superconductor has been a challenge for a long time [1]
We have shown that the existence of interorbital [8] components of the order parameter leads to natural explanation of the polar Kerr effect [9, 10] in strontium ruthenate and possibly other superconductors [11]
We shall only consider the superconducting states with chiral symmetry as only these states are expected to lead to nonzero dichroic signal observed in strontium ruthenate
Summary
The understanding of the many puzzling properties of Sr2RuO4 superconductor has been a challenge for a long time [1]. We have shown that the existence of interorbital [8] components of the order parameter leads to natural explanation of the polar Kerr effect [9, 10] in strontium ruthenate and possibly other superconductors [11]. The interactions between carriers occupying dxz and dyz orbitals lead to both intraorbital and interorbital order parameters responsible for the Kerr effect.
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