Scientific Papers

Phys. Rev. B 108, 165119 (2023)

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.

  • Received 9 August 2023
  • Revised 28 September 2023
  • Accepted 28 September 2023


©2023 American Physical Society

Condensed Matter, Materials & Applied Physics

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