Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Transport: Graphene and Carbon Nanotubes
TT 21.9: Vortrag
Dienstag, 26. Februar 2008, 18:00–18:15, EB 202
Orthogonality catastrophe and Kondo effect in graphene — •Martina Hentschel1 and Francisco Guinea2 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, D-01187 Dresden — 2Instituto de Ciencia de Materiales de Madrid, CSIC, E-28049 Madrid, Spain
We analyze Anderson’s orthogonality catastrophe in graphene, at energies close to the Dirac point. It is shown that in the clean system, 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 features similar to those found in normal metals with a finite density of states at the Fermi level [1]. We argue that, therefore, also the presence or absence of edge states is crucial for the behavior of the system. The implications for the Kondo effect induced by magnetic impurities, and for the Fermi edge singularities in tunneling processes, are also discussed.
[1] M. Hentschel and F. Guinea, Phys. Rev. B 76, 115407 (2007).