Fig. 5: DFT calculated second harmonic generation.
From: Terahertz optics-driven phase transition in two-dimensional multiferroics
Real part, imaginary part, and total frequency-dependent in-plane electronic contributed SHG spectra of monolayers a, b FE0-β-GeSe and d, e FE1-α-SnTe. Horizontal axis indicates incident energy ℏω. Inset shows k-resolved total SHG susceptibility distribution at ℏω = 0.82 eV (GeSe) and 0.36 eV (SnTe), indicated by the red circles. Polarization anisotropy of absolute SHG susceptibilities of c GeSe and f SnTe, where red and green curves indicate SHG susceptibility that are parallel and perpendicular to the polarization direction, respectively.
