Kekule-distortion-induced Exciton instability in graphene

Details Kekule-distortion-induced Exciton instability in graphene Kekule-distortion-induced Exciton instability in graphene

2008-06-20

arxiv.org/abs/0806.3349v2

Phys. Rev. B 78, 115417 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 1 figure

Scientific paper

10.1103/PhysRevB.78.115417

Effects of a Kekule distortion on exciton instability in single-layer graphene are discussed. In the framework of quantum electrodynamics the mass of the electron generated dynamically is worked out using a Schwinger-Dyson equation. For homogeneous lattice distortion it is shown that the generated mass is independent of the amplitude of the lattice distortion at the one-loop approximation. Formation of excitons induced by the homogeneous Kekule distortion could appear only through direct dependence of the lattice distortion.

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