Microscopic Theory of the Single Impurity Surface Kondo Resonance

Details Microscopic Theory of the Single Impurity Surface Kondo Resonance Microscopic Theory of the Single Impurity Surface Kondo Resonance

2003-07-09

arxiv.org/abs/cond-mat/0307185v2

Phys. Rev. B. 71, 035417 (2005)

Physics

Condensed Matter

Materials Science

New version of the original manuscript with extended discussions on the problem of wavefunction orthogonality, the limitations

Scientific paper

10.1103/PhysRevB.71.035417

We develop a microscopic theory of the single impurity Kondo effect on a metallic surface. We calculate the hybridization energies for the Anderson Hamiltonian of a magnetic impurity interacting with surface and bulk states and show that, contrary to the Kondo effect of an impurity in the bulk, the hybridization matrix elements are strongly dependent on the momentum around the Fermi surface. Furthermore, by calculating the tunneling conductance of a scanning tunneling microscope (STM), we show that when the magnetic impurity is located at a surface the Kondo effect can occur with equal strength between bulk and surface states. We compare our results with recent experiments of Co impurities in Cu(111) and Cu(100) surfaces and find good quantitative agreement.

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