Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points
Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points
The chiral photocurrent or circular photogalvanic effect (CPGE) is a photocurrent that depends on the sense of circular polarization. In a disorder-free, noninteracting chiral Weyl semimetal, the magnitude of the effect is approximately quantized with a material-independent quantum ${e}^{3}/{h}^{2}$ for reasons of band topology. We study the first-order corrections due …