Figure 6: Comparison of band structures of 12(8,0)/12(14,0) SL calculated with the TB (a) and Hubbard (b) models. In the Hubbard model all bands are spin degenerate. (c) LDOS at a single junction, including the Coulomb repulsion (the peaks positions correspond to the flat bands presented at (b)). Arrows and letters R/N indicate spin polarization and localization at the 8R and 8N octagons, respectively.