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Physical Review B
We compute from first principles the infrared dispersion of the nonlinear susceptibility χ^(2) in zincblende semiconductors. At terahertz frequencies the nonlinear susceptibility depends not only on the purely electronic response χ^(2)_∞, but also on three other parameters C_1, C_2 and C_3 describing the contributions from ionic motion. They relate to the TO Raman polarizability, the second-order displacement-induced dielectric polarization, and the third-order lattice potential. Contrary todoi:10.1103/physrevb.74.245204 fatcat:xnngquy2gvcbddctf2onweorkm