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Paper detail

Giant Surface Charge Density of Graphene Resolved From Scanning Tunneling Microscopy and First-Principles Theory

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.

preprint2015arXivOpen access
P. XuY. YangS. D. BarberM. L. AckermanJ. K. SchoelzI. A. KornevS. Barraza-LopezL. BellaicheP. M. Thibado
cond-mat.mes-hall
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Open access9 authors1 topic
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P. XuY. YangS. D. BarberM. L. AckermanJ. K. SchoelzI. A. KornevS. Barraza-LopezL. BellaicheP. M. Thibado

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