Pletikosić I, Kralj M, Pervan P, Brako R, Coraux J, N'diaye A T, Busse C, Michely T
Institut za fiziku, Bijenicka 46, 10000 Zagreb, Croatia.
Phys Rev Lett. 2009 Feb 6;102(5):056808. doi: 10.1103/PhysRevLett.102.056808.
Epitaxial graphene on Ir(111) prepared in excellent structural quality is investigated by angle-resolved photoelectron spectroscopy. It clearly displays a Dirac cone with the Dirac point shifted only slightly above the Fermi level. The moiré resulting from the overlaid graphene and Ir(111) surface lattices imposes a superperiodic potential giving rise to Dirac cone replicas and the opening of minigaps in the band structure.
通过角分辨光电子能谱对在Ir(111)上制备的具有优异结构质量的外延石墨烯进行了研究。它清晰地显示出一个狄拉克锥，其狄拉克点仅略微高于费米能级。由叠加的石墨烯和Ir(111)表面晶格产生的莫尔条纹施加了一个超周期势，从而产生狄拉克锥复制品并在能带结构中打开了微带隙。
