Orthogonality catastrophe and Kondo effect in graphene

Details Orthogonality catastrophe and Kondo effect in graphene Orthogonality catastrophe and Kondo effect in graphene

2007-05-03

arxiv.org/abs/0705.0522v1

Phys. Rev. B 76, 115407 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 7 figures

Scientific paper

10.1103/PhysRevB.76.115407

Anderson's orthogonality catastrophe in graphene, at energies close to the Dirac point, is analyzed. It is shown that, in clean systems, the orthogonality catastrophe is suppressed, due to the vanishing density of states at the Dirac point. In the presence of preexisting localized states at the Dirac energy, the orthogonality catastrophe shows similar features to those found in normal metals with a finite density of states at the Fermi level. The implications for the Kondo effect induced by magnetic impurities, and for the Fermi edge singularities in tunneling processes are also discussed.

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