Intrinsic Hall effect in a multiband chiral superconductor in the absence of an external magnetic field

TL;DR

This paper predicts an intrinsic anomalous Hall effect in multiband chiral superconductors without magnetic fields, which could help identify the pairing symmetry in materials like Sr2RuO4 through Kerr rotation measurements.

Contribution

It demonstrates that interband transitions in multiband chiral superconductors can produce a significant intrinsic Hall effect without external magnetic fields.

Findings

Intrinsic Hall effect arises from interband transitions in chiral superconductors.

The effect can influence Kerr rotation experiments in Sr2RuO4.

The magnitude depends on the order parameter structure across bands.

Abstract

We identify an intrinsic Hall effect in multiband chiral superconductors in the absence of a magnetic field (i.e., an anomalous Hall effect). This effect arises from interband transitions involving time-reversal symmetry-breaking chiral Cooper pairs. We discuss the implications of this effect for the putative chiral p-wave superconductor, Sr2RuO4, and show that it can contribute significantly to Kerr rotation experiments. Since the magnitude of the effect depends on the structure of the order parameter across the bands, this result may be used to distinguish between different models proposed for the superconducting state of Sr2RuO4.