Hello Kwant community, The Kwant package deals with the (dc) linear response for tight-binding models while TKwant is time-dependent. But it is not obvious to me from the documentation whether TKwant is capable of simulating nonlinear responses (at finite frequencies). Instead of naively assuming that it does not go beyond linear Kwant, it is probably worth asking here.
I'm particularly interested in finding nonlinear conductivities like a second-harmonic sigma(2w; w, w) and a dc response sigma(0; w, -w) with w the driving frequency. They are generated, e.g., by applying the ac bias driving voltage/current through the attached leads. If Tkwant does capture all such nonlinear effects, I presume one can simulate in the real time and transform the current/voltage response to the frequency space and obtain these results. Any relevant comment will be appreciated!
