Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-07-30
Phys. Rev. B 80, 184404 (2009).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12+ pages, 4 figures
Scientific paper
10.1103/PhysRevB.80.184404
We consider a Kondo spin that is coupled antiferromagnetically to a large chaotic quantum dot. Such a dot is described by the so-called universal Hamiltonian and its electrons are interacting via a ferromagnetic exchange interaction. We derive an effective Hamiltonian in the limit of strong Kondo coupling, where the screened Kondo spin effectively removes one electron from the dot. We find that the exchange coupling constant in this reduced dot (with one less electron) is renormalized and that new interaction terms appear beyond the conventional terms of the strong-coupling limit. The eigenenergies of this effective Hamiltonian are found to be in excellent agreement with exact numerical results of the original model in the limit of strong Kondo coupling.
Alhassid Yoram
Rotter Stefan
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