Enhancement of nonlocal exchange near isolated band crossings in graphene

Jeil Jung, Allan H. MacDonald

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The physics of nonlocal exchange interactions in graphene sheets is studied within a π-orbital tight-binding model using a Hartree-Fock approximation and Coulomb interactions modified at short distances by lattice effects and at large distances by dielectric screening. We use this study to comment on the strong nonlocality of exchange effects in systems with isolated band crossings at energies close to the Fermi energy. We also discuss the role of lattice scale details of the effective Coulomb interaction in determining whether or not broken-symmetry states appear at strong interaction strengths, and in determining the character of those states when they do appear.

Original languageEnglish
Article number085446
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number8
StatePublished - 29 Aug 2011


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