Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Correlated Electrons: Quantum Impurities, Kondo Physics
TT 30.5: Vortrag
Dienstag, 12. März 2013, 10:30–10:45, H21
Identifying Kondo orbitals through spatially resolved STS — •Andrey Antipov1,2, Pedro Ribeiro2, Johann Kroha3, and Stefan Kirchner1,2 — 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany — 2Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany — 3Physikalisches Institut and Bethe Center for Theoretical Physics, Universitat Bonn, Nussallee 12, 53115 Bonn, Germany
In this contribution we study the influence of angular degrees of freedom of magnetic adatoms on metallic surfaces onto scanning tunneling spectra. Kondo scattering of conduction electrons off the adatom changes the local density of states near the Fermi level. The spatial dependence of this correction is set by the orbital structure of the local moment localized on the adatom.
By considering a multilevel Anderson model with non-degenerate orbitals of differing orbital structure, using the multi orbital extension of the slave-boson mean field theory [1] we demonstrate that the spatial dependence of the scanning tunneling spectrum contains sufficient information to infer the orbital degrees of freedom of the magnetic adatom [2].
[1] P. Coleman, Phys. Rev. B 29, 3035-3044 (1984); J. Kroha et al., Physica E 18, 69 (2003)
A. E. Antipov, P. Ribeiro, J. Kroha, S. Kirchner, to be published