Hi Ali,
We subtract the sums because that is the definition of the conductance
matrix. However this complete function really should be written as
kwant.smatrix(syst, args=[p]).conductance_matrix() (see also the
documentation of the conductance_matrix from Kwant).
Best,
Anton
On Wed, Feb 15, 2017 at 3:43 PM, Ali Asgharpour
Hello all,
I have a question about one of the functions in this link: https://nbviewer.jupyter.org/url/topocondmat.org/notebooks/w3_pump_QHE/Laugh...
For plotting Hall conductance and longitudinal one, there is a section where you defined a G function, which I put it below:
def G(syst, p): smatrix = kwant.smatrix(syst, args=[p]) G = [[smatrix.transmission(i, j) for i in range(num_leads)] for j in range(num_leads)] G -= np.diag(np.sum(G, axis=0)) return calculate_sigmas(G)
I want to know why we need this line " G -= np.diag(np.sum(G, axis=0)) " since G matrix is already calculated in the previous line?
Your time and consideration are greatly appreciated.
Best regards,
Ali