Dear Adel， Thank you very much for your advice, I am looking at this tutorial now, but I have a doubt. >From https://kwant-project.org/doc/dev/tutorial/faq, I saw an example code: --------------------------------------------- a = 1 lat = kwant.lattice.square(a) syst = kwant.Builder() syst[lat(1, 0)] = 4 syst[lat(1, 1)] = 4 kwant.plot(syst) --------------------------------------------- And explained, In the above snippet we added 2 sites: lat(1, 0) and lat(0, 1). Both of these sites belong to the same family, lat, but have different tags: (1, 0) and (0, 1) respectively. syst[lat(1, 0)] and syst[lat(1, 1)] are written in the Code, why is site lat(1, 0) and lat(1, 1)?
Sincerely, Yue Xiang
