Transport through a multiply connected interacting meso-system using the Keldysh formalism

Abstract

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.

to appear in Phys. Rev. B

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Cited by in corpus (10)

• Kondo-Dicke resonances in electronic transport through triple quantum dots
• Dicke-like effect in spin-polarized transport through coupled quantum dots
• Interplay between interference and Coulomb interaction in the ferromagnetic Anderson model with applied magnetic field
• Kondo peaks and dips in the differential conductance of a multi-lead quantum dot: Dependence on bias conditions
• Interaction effects in Aharonov-Bohm-Kondo Rings
• Spin selective transport through Aharonov-Bohm and Aharonov-Casher triple quantum dot systems
• Coulomb oscillations of the Fano-Kondo effect and zero bias anomalies in the double dot meso-transistor
• Multi-terminal Anderson impurity model in nonequilibrium: Analytical perturbative treatment
• Conductance of closed and open long Aharonov-Bohm-Kondo rings
• Spin Current Generation as a Nonequilibrium Kondo Effect in a Spin-orbit Mesoscopic Interferometer