Journal
NUCLEAR PHYSICS B
Volume 687, Issue 3, Pages 323-331Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysb.2004.03.020
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We study excitonic pairing in quasi-two-dimensional degenerate semimetals such as graphite, where the electron density of states nearly vanishes at the Fermi level and, therefore, the Coulomb interactions remain unscreened. By focusing on the Dirac-like low-energy electronic excitations and numerically solving a non-linear gap equation for the excitonic order parameter, we obtain a critical value of the Coulomb coupling and establish the Kosterlitz-Thouless-like nature of the putative semimetal-to-excitonic insulator transition which can also be identified as a formal analog of chiral symmetry breaking in relativistic fermion theories. (C) 2004 Elsevier B.V. All rights reserved.
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