Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-11-19
Supercond. Sci. Technol, 17, 103 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Supercond. Sci. Technol. - accepted for publication
Scientific paper
10.1088/0953-2048/17/1/018
We study the electron transport through the quantum dot coupled to the normal metal and BCS-like superconductor (N - QD - S) in the presence of the Kondo effect and Andreev scattering. The system is described by the single impurity Anderson model in the limit of strong on-dot interaction. We use recently proposed equation of motion technique for Keldysh nonequilibrium Green's function together with the modified slave boson approach to study the electron transport. We derive formula for the current which contains various tunneling processes and apply it to study the transport through the system. We find that the Andreev conductance is strongly suppressed and there is no zero-bias (Kondo) anomaly in the differential conductance. We discuss effects of the particle-hole asymmetry in the electrodes as well as the asymmetry in the couplings.
Krawiec Mariusz
Wysokinski Karol Izydor
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