Electron states of mono- and bilayer graphene on SiC probed by scanning-tunneling microscopy | Zendy

Pierre Mallet | Zendy; F. Varchon | Zendy; Cécile Naud | Zendy; L. Magaud | Zendy; Claire Berger | Zendy; Jean-Yves Veuillen | Zendy

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Electron states of mono- and bilayer graphene on SiC probed by scanning-tunneling microscopy

Author(s) -

Pierre Mallet,

F. Varchon,

Cécile Naud,

L. Magaud,

Claire Berger,

Jean-Yves Veuillen

Publication year - 2007

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.76.041403

Subject(s) - scanning tunneling microscope , graphene , bilayer graphene , condensed matter physics , bilayer , physics , scanning tunneling spectroscopy , materials science , quantum tunnelling , fermi level , electron , atomic units , nanotechnology , chemistry , quantum mechanics , biochemistry , membrane

We present a scanning tunneling microscopy (STM) study of agently-graphitized 6H-SiC(0001) surface in ultra high vacuum. From an analysisof atomic scale images, we identify two different kinds of terraces, which weunambiguously attribute to mono- and bilayer graphene capping a C-richinterface. At low temperature, both terraces show $(\sqrt{3}\times \sqrt{3})$quantum interferences generated by static impurities. Such interferences are afingerprint of $\pi$-like states close to the Fermi level. We conclude that themetallic states of the first graphene layer are almost unperturbed by theunderlying interface, in agreement with recent photoemission experiments (A.Bostwick et al., Nature Physics 3, 36 (2007))Comment: 4 pages, 3 figures submitte

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