Fig. 5: An atlas of ZGNR bulk optical resonances.
From: 2N+4-rule and an atlas of bulk optical resonances of zigzag graphene nanoribbons

Optical resonances of the ZGNR atlas (large red open circles) obtained by linear mapping of the armchair SWCNT resonances (small blue filled circles) given by interpolating formula from Liu et al.11. The fitting formula from Jiang et al.49 (green solid curves) is added, as well as the energy differences (small open black circles) between the van Hove singularities symmetrically placed with respect to the Fermi level of ZGNRs (van Hove sym.) calculated based on ZGNR (av.) TBM from TableĀ 1.