Hi Joe, You are right, I have not noticed that. I rewritten it myself with "connect" doing both "id" and "T" things in one call (thus, there is no need to apply id ). Yes, I am scanning over analytic kx, ky momenta and use kwant's automatic symmetry along z to find evanescent modes in the lead. Degeneracy of evanescent modes will mean the possibility of edge states. Best wishes, Sergey On 31/07/15 15:11, Joseph Weston wrote:
Hi,
Dear Joe, I guess it should be [1] instead of [0] in your correction. We need not Id , but a unit shift. Well you first need to add all hoppings in a unit cell so we need to the identity group element, [0], and then we want hoppings from one unit cell to the next, so the group element [1]. In the example I posted a few mails back we had one then the other.
By the way, I am modelling the system with 3 symmetry vectors and do that by hand, moving all the k-phase to the hopping between edges. Best wishes, Sergey
Ah nice, you can then obtain 3D band structure by diagonalizing the finite problem with different k values yes?
Joe