Excitonic instability in two-dimensional degenerate semimetals

Details Excitonic instability in two-dimensional degenerate semimetals Excitonic instability in two-dimensional degenerate semimetals

2003-02-09

arxiv.org/abs/cond-mat/0302164v1

Nucl.Phys. B687 (2004) 323-331

Physics

Condensed Matter

Latex, 5 pages, 4 figures

Scientific paper

10.1016/j.nuclphysb.2004.03.020

We study the possibility of excitonic pairing in layered degenerate semimetals such as graphite, where the electron density of states almost vanishes at the Fermi level and, therefore, the Coulomb interactions remain essentially unscreened. By focusing on the Dirac-like low-energy electron excitations and numerically solving a non-linear gap equation for the order parameter, we obtain a critical value of the Coulomb coupling and establish the Kosterlitz-Thouless-like nature of a putative semimetal-to-excitonic insulator transition.

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