Topology
Chern Number
To compute the total Chern number of a set of bands
unitcell = make_unitcell(...)
hoppings = [...]
n1 = 256
n2 = 256
selectbands = [1,2,3]
ch = chernnumber(unitcell, hoppings, n1, n2, selectband; tol=tol)
which breaks up the two-dimensional
Z2 Index
Z2 index of time-reversal invariant topological insulator/superconductor.
z2 = z2index(...)