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- 13:45, 17 March 2025 SHG within the TD-aGW level (also called TD-HSEX, TD-BSE) (hist | edit) [12,371 bytes] Attacc (talk | contribs) (Created page with " Second-harmonic generation can be calculated also the TD-BSE level, the procedure is the same of the linear response case: the first one has to calculate the collisions integrals (see appendix of Ref.<ref name="Attaccalite2011"/>) and then can run simulation for the non-linear response as it is shown in this tutorial. Hereafter we will briefly repeat the steps necessary to obtain SHG including excitonic effects. 1) Downlo...")