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Interacting Electrons in Graphene: Fermi Velocity Renormalization and Optical Response

Stauber, T. ; Parida, P. ; Trushin, M. ; Ulybyshev, M. V. ; Boyda, D. L. ; Schliemann, John


We have developed a Hartree-Fock theory for electrons on a honeycomb lattice aiming to solve a long-standing problem of the Fermi velocity renormalization in graphene. Our model employs no fitting parameters (like an unknown band cutoff) but relies on a topological invariant (crystal structure function) that makes the Hartree-Fock sublattice spinor independent of the electron-electron ...


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