The effective Kondo model for a trimer on a metallic surface
Strongly Correlated Electrons
2009-11-11 v3 Mesoscale and Nanoscale Physics
Abstract
I consider a Hubbard-Anderson model which describes localized orbitals in three different atoms hybridized both among themselves and with a continuum of extended states (ES). Using a generalized Schrieffer-Wolf transformation, I derive an effective Kondo model for the interaction between the doublet ground state of the isolated trimer and the ES. For an isoceles trimer with distances a, l, l between the atoms, the Kondo temperature is negligigle for l < a and has a maximum for finite l > a when a is small. The results agree with experiments for a Cr trimer on Au(111). [T. Jamneala et al., Phys. Rev. Lett. 87, 256804 (2001)].
Cite
@article{arxiv.cond-mat/0509495,
title = {The effective Kondo model for a trimer on a metallic surface},
author = {A. A. Aligia},
journal= {arXiv preprint arXiv:cond-mat/0509495},
year = {2009}
}
Comments
4 pages, 3 figures, to appear in Phys. Rev. Lett. Clarifications on the parameters used were added