Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-05-10
Phys. Rev. Lett. 85, 2557 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, ReVTeX + 4 figures (Encapsulated Postscript), submitted to PRL
Scientific paper
10.1103/PhysRevLett.85.2557
The conduction electron density of states nearby single magnetic impurities, as measured recently by scanning tunneling microscopy (STM), is calculated, taking into account tunneling into conduction electron states only. The Kondo effect induces a narrow Fano resonance in the conduction electron density of states, while scattering off the d-level generates a weakly energy dependent Friedel oscillation. The line shape varies with the distance between STM tip and impurity, in qualitative agreement with experiments, but is very sensitive to details of the band structure. For a Co impurity the experimentally observed width and shift of the Kondo resonance are in accordance with those obtained from a combination of band structure and strongly correlated calculations.
Kroha Johann
Szunyogh László
Újsághy Orsolya
Zawadowski Alfred
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