Density-Functional Theory of Graphene Sheets

Details Density-Functional Theory of Graphene Sheets Density-Functional Theory of Graphene Sheets

2008-03-28

arxiv.org/abs/0803.4150v1

Phys. Rev. B 78, 115426 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 9 figures, submitted. High-quality figures can be requested to the authors

Scientific paper

10.1103/PhysRevB.78.115426

We outline a Kohn-Sham-Dirac density-functional-theory (DFT) scheme for graphene sheets that treats slowly-varying inhomogeneous external potentials and electron-electron interactions on an equal footing. The theory is able to account for the the unusual property that the exchange-correlation contribution to chemical potential increases with carrier density in graphene. Consequences of this property, and advantages and disadvantages of using the DFT approach to describe it, are discussed. The approach is illustrated by solving the Kohn-Sham-Dirac equations self-consistently for a model random potential describing charged point-like impurities located close to the graphene plane. The influence of electron-electron interactions on these non-linear screening calculations is discussed at length, in the light of recent experiments reporting evidence for the presence of electron-hole puddles in nearly-neutral graphene sheets.

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