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We investigate the effects of Na adsorption on the electronic structure ofbare and Ir cluster superlattice covered epitaxial graphene on Ir(111) usingangle-resolved photoemission spectroscopy and scanning tunneling microscopy. AtNa saturation coverage a massive charge migration from sodium atoms to grapheneraises the graphene Fermi level by about 1.4 eV relative to its neutralitypoint. We find that Na is adsorbed on top of the graphene layer and whencoadsorbed onto an Ir cluster superlattice it results in the opening of a largebandgap of {\Delta} = 740 meV comparable to the one of Ge and with preservedhigh group velocity of the charge carriers.

Large Bandgap Opening Between Graphene Dirac Cones Induced by Na Adsorption onto an Ir Superlattice