Hi everyone! I am a beginner Kwant consumer and, for this reason, I am trying
to "solve" very simple problems, i.e. problems for beginners. The first one is
the following:
I have a 1D problem where basically a spin-1/2 particle crosses a region
without a potential neither magnetic fields. I am able to write correctly the
setup of the problem in Kwant. Fixed the incoming particle energy, I find a 4
by 4 scattering matrix (this is comforting), but I do not understand which is
the protocol that Kwant uses to order the coefficients in the scattering
matrix. For example, according to the usual description of the transmission
matrix (from left-to-right), the element t_{00} corresponding to the
probability to start, for example, in the state s=-1/2 in the left lead and
arrives in the state s=-1/2 in the right lead, and similarly for the other
elements. How can I manage these labeling in my code?
Thank you!
