Fig. 4: CPGE calculations for CoSi.

a, b CPGE current obtained by ab-intio calculations corresponding to the CoSi band structure with spin-orbit coupling at different chemical potentials at a, 0 K with 5 meV broadening and b 300 K with 38 meV broadening. c, d CPGE current calculation from the k ⋅ p model, with parameters (v, a, b, c) = (1.79, 1.07, −1.72, 3.26). c The contributions to the CPGE current from transitions near the Γ point are shown by open purple circles for transitions from band 1 to 2 and as open gold squares for transitions form band 2 to 3. A solid blue line shows the sum of the contributions form transitions from 1 to 2 and from 2 to 3, which is the total CPGE contribution from the Γ point. d The contribution from the R point to the CPGE is shown by a step of 4 in red. The total contribution to the CPGE from the Γ and the R point is shown in green. A quantized dip/plateau is observed when the frequency is between \({\omega }_{1}^{R}\) and \({\omega }_{2}^{X}\), which allow transitions from band 1 to band 2 only. The dip is determined by transitions around Γ only, while the peak has contributions from excitations near the Γ and R points.