Fig. 4: Nonlinear photocurrent response of CeCrN₃.

a HSE06-calculated shift current spectrum of \({\sigma }_{{zz}}^{z}\). b The SC(k) function at initial peak in FE phases and c FE’ phases. d HSE06-calculated injection current spectrum of \({\eta }_{{yz}}^{y}\). The IC(k) function at e initial peak in FE phases and f FE’ phases.