Photon-spin-dependent Contribution to the P,T -Odd Faraday Rotation Effect for Atoms

The photon-spin-dependent (PS) contribution to the ordinary Faraday effect—optical rotation in an external magnetic field H⃗ is well known. This contribution is proportional to factor (s⃗ph⋅H⃗) where s⃗ph is the photon spin. Recently a P,T -odd Faraday effect—optical rotation in an external electric field E⃗ —was discussed as a promising tool for observation of the electron electric dipole moment in the intra-cavity absorption spectroscopy. In the present paper, we introduce the PS contribution to the P,T -odd Faraday rotation effect. This contribution is proportional to (s⃗ph⋅E⃗) and has to be taken into account in the calculations of the P,T -odd Faraday effect.