Good morning,
> Hi Joe, Thank you, now it works! Nice! > But I am a bit confused about the physical meaning of the current, > created by modes in lead n. How to plot the real current between the > two leads? Imagine, as the simplest case, that my geometry is > inversion-symmetric, so that lead 0 goes into lead 1 under > inversion. Then I expect the current to be inversion-symmetric as well. Summing the current contributions for *all* the scattering states originating from lead L at an energy E gives you the current you would measure if the fermi levels in all the leads are at energy E and you apply an infinitesimal voltage to lead L. For example if we want to see the current profile if we add an infinitesimal voltage dV to lead 0: wfs = kwant.wave_function(syst, energy=E, params=...) J_0 = dV * sum(J(psi) for psi in wfs(0)) This is analogous to the transmission obtained by kwant.smatrix: smatrix = kwant.smatrix(syst, energy=E, params=...) I_10 = dV * smatrix.transmission(1, 0) I_10 is the current we would measure in lead 1 after applying dV to lead 0. In the above I have elided the e^2/h factor for brevity, but hopefully I have been clear enough to get the point across. Hope that helps, Joe
