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Title: A pertubative approach to the Kondo effect in magnetic atoms on nonmagnetic substrates
Sponsor: Irish Research Council for Science Engineering and Technology
Author's Homepage:
Keywords: Particles and fields physics
magnetic atoms
Issue Date: 2011
Citation: Aaron Hurley, Nadjib Baadji, Stefano Sanvito, A pertubative approach to the Kondo effect in magnetic atoms on nonmagnetic substrates, 2011
Abstract: Recent experimental advances in scanning tunneling microscopy make the measurement of the conductance spectra of isolated and magnetically coupled atoms on nonmagnetic substrates possible. Notably these spectra are characterized by a competition between the Kondo effect and spin-flip inelastic electron tunneling. In particular they include Kondo resonances and a logarithmic enhancement of the conductance at voltages corresponding to magnetic excitations, two features that cannot be captured by second order perturbation theory in the electron-spin coupling. We have now derived a third order analytic expression for the electron-spin self-energy, which can be readily used in combination with the non-equilibrium Green's function scheme for electron transport at finite bias. We demonstrate that our method is capable of quantitative description the competition between Kondo resonances and spin-flip inelastic electron tunneling at a computational cost significantly lower than that of other approaches. The examples of Co and Fe on CuN are discussed in detail.
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Appears in Collections:Physics (Scholarly Publications)

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