Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-05-11
New Journal of Physics 12, 093018 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages, 6 figures
Scientific paper
Graphene epitaxially grown on Ru(0001) displays a remarkably ordered pattern of hills and valleys in Scanning Tunneling Microscopy (STM) images. To which extent the observed "ripples" are structural or electronic in origin have been much disputed recently. A combination of ultrahigh resolution STM images and Helium Atom diffraction data shows that i) the graphene lattice is rotated with respect to the lattice of Ru and ii) the structural corrugation as determined from He diffraction is substantially smaller (0.015 nm) than predicted (0.15 nm) or reported from X-Ray Diffraction or Low Energy Electron Diffraction. The electronic corrugation, on the contrary, is strong enough to invert the contrast between hills and valleys above +2.6 V as new, spatially localized electronic states enter the energy window of the STM. The large electronic corrugation results in a nanostructured periodic landscape of electron and holes pockets.
Barja Sara
Borca Bogdana
Farías Daniel
Garnica Manuela
Hinarejos Juan Jose
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