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Orthogonality catastrophe and Kondo effect in graphene

机译:石墨烯的正交突变和近藤效应

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摘要

Anderson's orthogonality catastrophe [Phys. Rev. Lett. 18,1049 (1967)] 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 features similar 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.
机译:安德森的正交性灾难[Phys。牧师[18,1049(1967)]分析了石墨烯中接近狄拉克点的能量。结果表明,在干净的系统中,由于狄拉克点处的状态消失,正交灾难被抑制了。在狄拉克能量处存在预先存在的局部态的情况下,正交性突变显示的特征与在费米能级有限密度的普通金属中发现的特征相似。还讨论了由磁性杂质引起的近藤效应以及在隧穿过程中对费米边缘奇异性的影响。

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