Issue
EPL
Volume 85, Number 4, February 2009
Article Number 47002
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/85/47002
Published online 16 February 2009
EPL, 85 (2009) 47002
DOI: 10.1209/0295-5075/85/47002

Toward a microscopic description of Kondo dimers on metallic surfaces

J. Merino1, L. Borda2 and P. Simon3, 4

1   Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid Madrid E-28049, Spain, EU
2   Physikalisches Institut and Bethe Center for Theoretical Physics, Universität Bonn Nussallee 12 D-53115 Bonn, Germany, EU
3   Department of Physics and Astronomy, University of Basel - CH-4056 Basel, Switzerland
4   Laboratoire de Physique et Modélisation des Milieux Condensés, CNRS and Université Joseph Fourier BP 166, F-38042 Grenoble, France, EU

jaime.merino@uam.es

received 21 November 2008; accepted in final form 25 January 2009; published February 2009
published online 16 February 2009

Abstract
Despite the experimental successes of scanning tunneling microscopy (STM) and the interest in more complex magnetic nanostructures, our present understanding and theoretical description of STM spectra of magnetic adatoms is mainly phenomenological and most often ignores quantum many-body effects. Here, we propose a theory which includes a microscopic description of the wave functions of the substrate and magnetic adatoms together with the quantum many-body effects. To test our theory, we have computed the STM spectra of magnetic cobalt monomers and dimers adsorbed on a metallic copper surface and successfully compared our results to recent available experimental data.

PACS
72.15.Qm - Scattering mechanisms and Kondo effect.
68.37.Ef - Scanning tunneling microscopy (including chemistry induced with STM).
75.30.Hx - Magnetic impurity interactions.

© EPLA 2009