Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-06-12
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 5 eps figure files
Scientific paper
We consider the theory of Kondo effect and Fano factor energy dependence for magnetic impurity (Co) on graphene. We have performed a first principles calculation and find that the two dimensional $E_1$ representation made of $d_{xz},d_{yz}$ orbitals is likely to be responsible for the hybridization and ultimately Kondo screening for cobalt on graphene. There are few high symmetry sites where magnetic impurity atom can be adsorbed. For the case of Co atom in the middle of hexagon of carbon lattice we find anomalously large Fano $q$-factor, $q\approx 80$ and strongly suppressed coupling to conduction band. This anomaly is a striking example of quantum mechanical interference related to the Berry phase inherent to graphene band structure.
Balatsky Alexander V.
Dahal Hari P.
Katsnelson Mikhail I.
Lichtenstein Alexander I.
Manoharan H.
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