TeNPy Forum

Hi all!, I am trying to implement a fully connected model \sum_{i<j} J_{ij}(X_iX_j + Y_iY_j + Z_iZ_j) . Currently, i am doing something like this lat = Chain(L, spin_site, bc=bc, bc_MPS = bc_MPS) CouplingModel.__init__(self, lat) for i in range(L-1): for j in range(i+1,L): dx = np.array([[1]]) self....