Thanks for your prompt reply Mr. Wintal. I did not calculate the Green function and obtained the G-E diagram using the transmission method introduced in the Green function class. Another method introduced in this class is conductance_matrix (), ( https://kwant-project.org/doc/1/reference/generated/kwant.solvers.common.GreensFunction.html?highlight=green%20function ) which relates the current vector to the voltage vector. Can I use this method and get to the I-V diagram? I also want to check the temperature parameter in this system and see the device's behavior under different temperatures. thanks Leo
On Tue, Jun 30, 2020 at 4:29 PM Xavier Waintal <[email protected]> wrote: > dear Leo, > > If you have calculated the conductance G(E) of a 2 terminal device, > the current I at finite voltage V is given by > > I = Integral dE G(E) [ f(E-mu_L) - f(E-mu_R) ] > where mu_L and mu_R are the chemical potential of the two electrodes, f(E) > is > the Fermi function. mu_L - mu_R = eV where V is the voltage drop across > the devices. > > Beware that this equation assumes a NON INTERACTING system and can lead to > physically wrong results. > (It neglects the electrostatic which becomes almost always relevant at > finite bias). > > Best regards, > Xavier > > > > Le 30 juin 2020 à 13:37, <[email protected]> <[email protected]> a > écrit : > > > > dear all > > I have done my project using Kwant and I have drawn a conductance-energy > diagram for the system. > > The question I have is how can I get the current-voltage diagram? > > thanks > > Leo > >
