Excitonic instability in layered degenerate semimetals
作者： D.V. Khveshchenko , H. Leal
DOI: 10.1016/J.NUCLPHYSB.2004.03.020
关键词: Instability 、 Critical value 、 Condensed matter physics 、 Pairing 、 Fermi level 、 Fermion 、 Chiral symmetry breaking 、 Degenerate energy levels 、 Quantum mechanics 、 Physics 、 Coulomb
摘要: Abstract We study excitonic pairing in quasi-two-dimensional degenerate semimetals such as graphite, where the electron density of states nearly vanishes at Fermi level and, therefore, Coulomb interactions remain unscreened. By focusing on Dirac-like low-energy electronic excitations and numerically solving a non-linear gap equation for order parameter, we obtain critical value coupling establish Kosterlitz–Thouless-like nature putative semimetal-to-excitonic insulator transition which can also be identified formal analog chiral symmetry breaking relativistic fermion theories.
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