Dec. 9, 2014
10:43 a.m.
Hi Anant, You are setting the values of your sites and hoppings to “None”. That is, you define the structure of your Hamiltonian matrix but not its values. Note that I also use “None” in my graphene band structure example, but only in the ancillary system that is not used for calculations. Surely you could have found the solution to this problem yourself. Please try harder next time before asking for help. Christoph