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Graphene on Ir(111) characterized by angle-resolved photoemission

Spectroscopic investigation of the electronic properties of graphene on Ir(111).

M. Kralj et al., Phys. Rev. B 84, 075427 (2011)

Angle-resolved photoelectron spectroscopy (ARPES) is extensively used to characterize the dependence of the electronic structure of graphene on Ir(111) on the preparation process. ARPES findings reveal that temperature-programmed growth alone or in combination with chemical vapor deposition leads to graphene displaying sharp electronic bands. The photoemission intensity of the Dirac cone is monitored as a function of the increasing graphene area. Electronic features of the moir´e superstructure present in the system, namely, minigaps and replica bands are examined and used as robust features to evaluate graphene uniformity. The overall dispersion of the π band is analyzed. Finally, by the variation of photon energy, relative changes of the π and σ band intensities are demonstrated.


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PHYSICAL REVIEW B 84, 075427 (2011)
Last Updated on Monday, 23 January 2012 16:59