On geometric delusions of hexagonal structures
  The confining geometries of fermions in 2D structures exhibits interesting results that have highest symmetry. Delusion can be considered as the topological effect which is topological invariant. Topologically, genus zero surfaces needs excess of pentagons while in surfaces g>2 surfaces needs excess of heptagons. The curvature effect and the rise of effective gauge field can be interpreted from delusion effects in hexagonal lattice. This idea is novel in its scope as it can state theoretical description of structures and their stability. 
M. J. I. Khan, S. Babar
cond-mat.mes-hall