Disorder and interaction effects in two dimensional graphene sheets

Details Disorder and interaction effects in two dimensional graphene sheets Disorder and interaction effects in two dimensional graphene sheets

2003-11-02

arxiv.org/abs/cond-mat/0311016v1

Phys. Rev. B 71, 041406(R) (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.71.041406

The interplay between different types of disorder and electron-electron interactions in graphene planes is studied by means of Renormalization Group techniques. The low temperature properties of the system are determined by fixed points where the strength of the interactions remains finite, as in one dimensional Luttinger liquids. These fixed points can be either stable (attractive), when the disorder is associated to topological defects in the lattice or to a random mass term, or unstable (repulsive) when the disorder is induced by impurities outside the graphene planes. In addition, we analyze mid-gap states which can arise near interfaces or vacancies.

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