Direct oriented growth of armchair graphene nanoribbons on germanium

Robert M. Jacobberger, Brian Kiraly, Matthieu Fortin-Deschenes, Pierre L. Levesque, Kyle M. McElhinny, Gerald J. Brady, Richard Rojas Delgado, Susmit Singha Roy, Andrew Mannix, Max G. Lagally, Paul G. Evans, Patrick Desjardins, Richard Martel, Mark C. Hersam, Nathan P. Guisinger, Michael S. Arnold^*