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Giant Surface Charge Density of Graphene Resolved From Scanning Tunneling Microscopy and First-Principles Theory (1502.02568v1)
Published 9 Feb 2015 in cond-mat.mes-hall
Abstract: In this work, systematic constant-bias, variable-current scanning tunneling microscopy (STM) measurements and STM simulations from density-functional theory are made, yielding critical insights into the spatial structure of electrons in graphene. A foundational comparison is drawn between graphene and graphite, showing the surface charge density of graphene to be 300 percent that of graphite. Furthermore, simulated STM images reveal that high-current STM better resolves graphenes honeycomb bonding structure because of a retraction which occurs in the topmost dangling bond orbitals.