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

P. Xu; Y. Yang; S. D. Barber; M. L. Ackerman; J. K. Schoelz; I. A. Kornev; S. Barraza-Lopez; L. Bellaiche; P. M. Thibado

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

Mesoscale and Nanoscale Physics 2015-02-10 v1

Authors: P. Xu , Y. Yang , S. D. Barber , M. L. Ackerman , J. K. Schoelz , I. A. Kornev , S. Barraza-Lopez , L. Bellaiche , P. M. Thibado

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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.

Keywords

graphene surface charge density scanning tunneling microscopy density-functional theory graphite honeycomb bonding structure dangling bond orbitals

Cite

@article{arxiv.1502.02568,
  title  = {Giant Surface Charge Density of Graphene Resolved From Scanning Tunneling Microscopy and First-Principles Theory},
  author = {P. Xu and Y. Yang and S. D. Barber and M. L. Ackerman and J. K. Schoelz and I. A. Kornev and S. Barraza-Lopez and L. Bellaiche and P. M. Thibado},
  journal= {arXiv preprint arXiv:1502.02568},
  year   = {2015}
}

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18 pages, 3 figures

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

Abstract

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