Phys. Rev. Lett. 100, 256405 (2008) [4 pages]Survival of the Dirac Points in Rippled GrapheneReceived 31 March 2008; published 26 June 2008 We study the effects of the rippling of a graphene sheet on quasiparticle dispersion. This is achieved using a generalization to the honeycomb lattice of the momentum average approximation, which is accurate for all coupling strengths and at all energies. We show that even though the position of the Dirac points may move and the Fermi speed can be renormalized significantly, quasiparticles with very long lifetimes survive near the Dirac points even for very strong couplings. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.256405
DOI:
10.1103/PhysRevLett.100.256405
PACS:
71.38.−k, 81.05.Uw
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