Fig. 2: Origins of the intrinsic optical Hall effect in crystalline chiral superconductors.
From: Circular-polarization-selective perfect reflection from chiral superconductors

The PC-symmetric optical transitions are forbidden in superconductors when (PC)2 = −1, which strongly suppresses the anomalous Hall effect, originating from interband (virtual or resonant) optical transitions. The Hall effect originates from the channels that are allowed by the selection rule. Here, we focus on intrinsic mechanisms and do not consider extrinsic impurity contributions to the anomalous Hall conductivity.