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C and 1 bar) is found to be azigzag GNR (zzGNR). The stability of this new GNR is understood based on an electron-counting model, whichpredictssemiconductingnonmagneticzzGNRs.QuantumconnementofDiracfermionsinthestablezzGNRsisfound to be qualitatively different from that in ordinary semiconductors. Bifurcation of the band gap is predictedto take place, leading to the formation of polymorphs with distinct band gaps but equal thermodynamic stability.A tight-binding model analysis reveals the role of edge symmetry on the band-gap bifurcation.DOI: 10.1103/PhysRevB.85.195464 PACS number(s): 73

Phase diagram of graphene nanoribbons and band-gap bifurcation of Dirac fermions under quantum confinement