Excess Kondo Resonance in a Quantum Dot Device with Normal and Superconducting Leads: The Physics of Andreev-Normal Co-tunneling
Qing-feng Sun, Hong Guo, Tsung-han Lin
DOI 10.1103/PhysRevLett.87.176601 · Physical Review Letters
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Abstract
We report on a novel Kondo phenomenon of interacting quantum dots coupled asymmetrically to a normal and a superconducting lead. The effects of intradot Coulomb interaction and Andreev tunneling give rise to Andreev bound resonances. As a result, a new type of co-tunneling process, which we term Andreev-normal co-tunneling, is predicted. At low temperatures, coherent superposition of these co-tunneling processes induces a Kondo effect in which Cooper pairs directly participate formation of a spin singlet, leading to four Kondo resonance peaks in the local density of states, and enhancing the tunneling current.
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