Zero-energy edge states and chiral symmetry breaking at edges of graphite sheets

Details Zero-energy edge states and chiral symmetry breaking at edges of graphite sheets Zero-energy edge states and chiral symmetry breaking at edges of graphite sheets

2003-11-26

arxiv.org/abs/cond-mat/0311595v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, Proceedings of EP2DS15

Scientific paper

10.1016/j.physe.2003.12.098

Two-dimensional graphite sheets with a certain type of edges are known to support boundary states localized near the edges. Forming a flat band with a sharp peak in the density of states at the Fermi energy, they can trigger a magnetic instability or a distortion of the lattice in the presence of electron-electron or electron-phonon interactions. We shall discuss a relationship between chiral symmetry, which is the origin of the zero-energy edge states, and several types of induced orders such as spin density waves or lattice distortions. We also investigate electron correlation effects on the edge states for a wrapped quasi one-dimensional geometry, i.e., carbon nanotube, by means of the renormalization group and the open boundary bosonization.

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