Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-09-05
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.76.113302
We apply the Keldysh formalism in order to derive a current formula easy to use for a system with many sites, one of which is interacting. The main technical challenge is to deal with the lesser Green function. It turns out that, in the case of the left-right symmetry, the knowledge of the lesser Green function is not necessary and an exact current formula can be expressed in terms of retarded Green functions only. The application is done for a triangular interferometer which gives a good account of the Fano-Kondo effect. It is found that the interference effects, in the context of Kondo correlations, give rise to a point in the parameters space where the conductance is temperature-independent. We include a comparison with the results from the Ng's ansatz, which are less accurate, but can be used also in the absence of the above mentioned symmetry.
Aldea Alexandru
Dinu I. V.
Ţolea Mugurel
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