We study wire networks that are the complements of triply periodic minimal
surfaces. Here we consider the P, D, G surfaces which are exactly the cases in
which the corresponding graphs are symmetric and self-dual. Our approach is
using the Harper Hamiltonian in a constant magnetic field. We treat this system
with the methods of noncommutative geometry and obtain a classification for all
the C∗ geometries that appear.Comment: 15 pages, 5 figure