Charge localization around disclinations in monolayer graphite
  Using a continuum model, we obtain qualitative results that imply charge localization around negative curvature disclinations (i.e. rings with more than 6 Carbon atoms) in a graphite sheet. Conversely, it is found that positive curvature disclinations repel charge, independent of its sign. 
Claudio Furtado and Fernando Moraes