Unique properties of the optical activity in noncentrosymmetric superconductors: Sum rule, missing area, and relation with the superconducting Edelstein effect

Koki Shinada; Robert Peters

doi:10.1103/PhysRevB.108.165119

← Back to search

Unique properties of the optical activity in noncentrosymmetric superconductors: Sum rule, missing area, and relation with the superconducting Edelstein effect

Koki Shinada, Robert Peters

DOI 10.1103/PhysRevB.108.165119 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We present general properties of the optical activity in noncentrosymmetric materials, including superconductors. We derive a sum rule of the optical activity in general electric states and show that the summation of the spectrum is zero, which is independent of the details of electric states. The optical activity has a δ-function singularity that vanishes in normal phases. However, the singularity emerges in superconducting phases, corresponding to the Meissner effect in the optical conductivity. The spectrum decreases by the superconducting gap and has a missing area compared to the normal phase. This area is exactly equivalent to the coefficient of the δ-function singularity due to the universal sum rule. Furthermore, the coefficient is exactly equivalent to the superconducting Edelstein effect, which has not yet been observed in experiments. Thus this measurement of the missing area offers an alternative way to observe the superconducting Edelstein effect.