Spectromicroscopy of single and multilayer graphene supported by a weakly interacting substrate

We report measurements of the electronic structure and surface morphology of exfoliated graphene on an insulating substrate using angle-resolved photoemission and low-energy electron diffraction. Our results show that, although exfoliated graphene is microscopically corrugated, the valence band retains a massless fermionic dispersion with a Fermi velocity of $\ensuremath{\sim}{10}^{6}\text{ }\text{m}/\text{s}$. We observe a close relationship between the morphology and electronic structure, which suggests that controlling the interaction between graphene and the supporting substrate is essential for graphene device applications.

[1]  U. Rüdiger,et al.  Rashba effect in the graphene/ni(111) system. , 2007, Physical review letters.

[2]  T. Ohta,et al.  Morphology of graphene thin film growth on SiC(0001) , 2007, 0710.0877.

[3]  M. Nagase,et al.  Microscopic thickness determination of thin graphite films formed on SiC from quantized oscillation in reflectivity of low-energy electrons , 2007, 0710.0469.

[4]  F. Guinea,et al.  Periodically rippled graphene: growth and spatially resolved electronic structure. , 2007, Physical review letters.

[5]  K. Klitzing,et al.  Observation of electron–hole puddles in graphene using a scanning single-electron transistor , 2007, 0705.2180.

[6]  E. Williams,et al.  Atomic structure of graphene on SiO2. , 2007, Nano letters.

[7]  G. Flynn,et al.  High-resolution scanning tunneling microscopy imaging of mesoscopic graphene sheets on an insulating surface , 2007, Proceedings of the National Academy of Sciences.

[8]  M I Katsnelson,et al.  Intrinsic ripples in graphene. , 2007, Nature materials.

[9]  S. Das Sarma,et al.  Statistics of random voltage fluctuations and the low-density residual conductivity of graphene , 2007, cond-mat/0702117.

[10]  Jannik C. Meyer,et al.  The structure of suspended graphene sheets , 2007, Nature.

[11]  Andre K. Geim,et al.  Raman spectrum of graphene and graphene layers. , 2006, Physical review letters.

[12]  T. Ohta,et al.  Controlling the Electronic Structure of Bilayer Graphene , 2006, Science.

[13]  A. V. Fedorov,et al.  First direct observation of Dirac fermions in graphite , 2006, cond-mat/0608069.

[14]  C. Hierold,et al.  Spatially resolved Raman spectroscopy of single- and few-layer graphene. , 2006, Nano letters.

[15]  P. Eklund,et al.  Raman scattering from high-frequency phonons in supported n-graphene layer films. , 2006, Nano letters.

[16]  M I Katsnelson,et al.  Strong suppression of weak localization in graphene. , 2006, Physical review letters.

[17]  Takashi Takahashi,et al.  Fermi surface and edge-localized states in graphite studied by high-resolution angle-resolved photoemission spectroscopy , 2006 .

[18]  F. Guinea,et al.  Electronic properties of disordered two-dimensional carbon , 2005, cond-mat/0512091.

[19]  P. Kim,et al.  Experimental observation of the quantum Hall effect and Berry's phase in graphene , 2005, Nature.

[20]  A. Geim,et al.  Two-dimensional gas of massless Dirac fermions in graphene , 2005, Nature.

[21]  M. Altman.  Low energy electron microscopy of quantum well resonances in Ag films on W(110) , 2005 .

[22]  A. Kaminski,et al.  On the extraction of the self-energy from angle-resolved photoemission spectroscopy , 2005 .

[23]  K. L. Man,et al.  Kinetic limitations in electronic growth of Ag films on Fe(100). , 2004, Physical review letters.

[24]  Andre K. Geim,et al.  Electric Field Effect in Atomically Thin Carbon Films , 2004, Science.

[25]  C. Berger,et al.  Ultrathin epitaxial graphite: 2D electron gas properties and a route toward graphene-based nanoelectronics. , 2004, cond-mat/0410240.

[26]  F. Physik,et al.  Surface intercalation of gold underneath a graphite monolayer on NiÑ111Ö studied by angle-resolved photoemission and high-resolution electron-energy-loss spectroscopy , 2000 .

[27]  J.-M. Themlin,et al.  HETEROEPITAXIAL GRAPHITE ON 6H-SIC(0001): INTERFACE FORMATION THROUGH CONDUCTION-BAND ELECTRONIC STRUCTURE , 1998 .

[28]  Shirley,et al.  Brillouin-zone-selection effects in graphite photoelectron angular distributions. , 1995, Physical review. B, Condensed matter.

[29]  David P. DiVincenzo,et al.  Self-consistent effective-mass theory for intralayer screening in graphite intercalation compounds , 1984 .

[30]  W. A. Dench,et al.  Quantitative electron spectroscopy of surfaces: A standard data base for electron inelastic mean free paths in solids , 1979 .

[31]  D. Eastman,et al.  Photoemission Measurements of the Valence Levels of Amorphous SiO 2 , 1971 .

[32]  P. Wallace.  The Band Theory of Graphite , 1947 .

[33]  T. Ohta,et al.  Quasiparticle dynamics in graphene , 2007 .