Andreev tunneling in quantum dots: A slave-boson approach
P. Schwab, R. Raimondi
DOI 10.1103/PhysRevB.59.1637 · Physical Review B
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Abstract
We study a strongly interacting quantum dot connected to a normal and to a superconducting lead. By means of the slave-boson technique we investigate the low-temperature regime and discuss electrical transport through the dot. At the level of mean-field approximation we are able to discuss both limits of small and large Δ/TK, where Δ is the superconducting gap and TK is the Kondo temperature. We also find that the zero-bias anomaly in the current-voltage characteristics, which is associated with the occurrence of the Kondo resonance in the quantum dot, is enhanced in the presence of superconductivity, due to resonant Andreev scattering.
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