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M. Sprinkle, D. Siegel, Y. Hu, J. Hicks, A. Tejeda, A. Taleb-Ibrahimi, P. Le Fe’vre, F. Bertran, S. Vizzini, H. Enriquez, S. Chiang, P. Soukiassian, C. Berger, W. A. de Heer, A. Lanzara and E. H. Conrad, “First Direct Obser- vation of a Nearly Ideal Graphene Band Structure,” Phy- sical Review Letters, Vol. 103, No. 22, 2009, Article ID: 226803. doi:10.1103/PhysRevLett.103.226803

has been cited by the following article:

• TITLE: Na Induced Changes in the Electronic Band Structure of Graphene Grown on C-Face SiC

  AUTHORS: Leif I. Johansson, Chao Xia, Chariya Virojanadara

  KEYWORDS: Graphene on C-Face SiC; Graphene Band Structure; Na Intercalation; Constant Energy Photoelectron Angular Distribution Patterns

  JOURNAL NAME: Graphene, Vol.2 No.1, January 24, 2013

  ABSTRACT: Studies of the effects induced on the electron band structure after Na deposition, and subsequent heating, on a C-face 2 MLs graphene sample are reported. Na deposition shifts the Dirac point downwards from the Fermi level by about 0.5 eV due to electron doping. After heating at temperatures from around 120℃ to 300℃,thep-band appears considerably broadened. Collected Si 2p and Na 2p spectra then indicate Na intercalation in between the graphene layers and at the graphene SiC interface. The broadening is therefore interpreted to arise from the presence of two slightly shifted, but not clearly resolved,p-bands. Constant energy photoelectron distribution patterns, E(kx,ky);s, extracted from the clean 2MLs graphene C-face sample look very similar to earlier calculated distribution patterns for monolayer, but not Bernal stacked bilayer, graphene. After Na deposition the patterns extracted at energies below the Dirac point appear very similar so the doping had no pronounced effect on the shape or intensity distribution. At energies above the Dirac point the extracted angular distribution patterns show the flipped, “mirrored”, intensity distribution predicted for monolayer graphene at these energies. An additional weaker outer band is also discernable at energies above the Dirac point, which presumably is induced by the deposited Na.