Generalized Schrieffer-Wolff Transformation of 2 Kondo Impurity Problem

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We have carried out a generalized Schrieffer-Wolff transformation of an Anderson two-impurity Hamiltonian to study the low-energy spin interactions of the system. The second-order expansion yields the standard Kondo Hamiltonian for two impurities with additional scattering terms. At fouth-order, we get the well-known RKKY interaction. In addition, we also find an antiferromagnetic superexchange coupling and a correlated Kondo coupling between the two impurities.
6 pages, 3 figures

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Strongly Correlated Electrons, Mesoscale and Nanoscale Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/108326

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0602223
 http://arxiv.org/abs/cond-mat/0602223

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arXiv