Enhancement of non-local exchange near isolated band-crossings in graphene

Details Enhancement of non-local exchange near isolated band-crossings in graphene Enhancement of non-local exchange near isolated band-crossings in graphene

2011-05-03

arxiv.org/abs/1105.0463v1

Phys. Rev. B 84, 085446 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 7 figures, 1 table

Scientific paper

10.1103/PhysRevB.84.085446

The physics of non-local exchange interactions in graphene sheets is studied within a $\pi$-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 non-locality 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.

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