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Author Valenzuela, Belen ♦ Vozmediano, Maria A. H.
Source arXiv.org
Content type Text
File Format PDF
Date of Submission 2008-07-31
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics
Subject Keyword Condensed Matter - Strongly Correlated Electrons ♦ Condensed Matter - Mesoscale and Nanoscale Physics ♦ physics:cond-mat
Abstract The density of states of graphene has Van Hove singularities that can be reached by chemical doping and have already been explored in photoemission experiments. We show that in the presence of Coulomb interactions the system at the Van Hove filling is likely to undergo a Pomeranchuk instability breaking the lattice point group symmetry. In the presence of an on--site Hubbard interaction the system is also unstable towards ferromagnetism. We explore the competition of the two instabilities and build the phase diagram. We also suggest that, for doping levels where the trigonal warping is noticeable, the Fermi liquid state in graphene can be stable up to zero temperature avoiding the Kohn--Luttinger mechanism and providing an example of two dimensional Fermi liquid at zero temperature.
Description Reference: New J. Phys. 10 (2008) 113009
Educational Use Research
Learning Resource Type Article
Page Count 7


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