xy_nnn_hop Function

public pure function xy_nnn_hop(layout, S, i) result(Ni)

Return the i-th next-nearest neighbor of a lattice site, by taking two xy_nn_hops in the suitable direction. You can feed any i ∈ ℤ, but you can get only 6 inequivalent neighbors, depending on the label of the given site: "A" and "B" activate two different suitable sets of NN hops, A lattice layout is required to build the concrete hoppings.

Arguments

Type	Intent	Optional	Attributes		Name
type(unit_cell),	intent(in)			::	layout
type(xy_site),	intent(in)			::	S
integer,	intent(in)			::	i

Return Value type(xy_site)