Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots

Details Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots

2007-03-10

arxiv.org/abs/cond-mat/0703264v1

Phys. Rev. Lett. 99, 126603 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.99.126603

We report measurements of the nonlinear conductance of InAs nanowire quantum dots coupled to superconducting leads. We observe a clear alternation between odd and even occupation of the dot, with sub-gap-peaks at $|V_{sd}|=\Delta/e$ markedly stronger(weaker) than the quasiparticle tunneling peaks at $|V_{sd}|=2\Delta/e$ for odd(even) occupation. We attribute the enhanced $\Delta$-peak to an interplay between Kondo-correlations and Andreev tunneling in dots with an odd number of spins, and substantiate this interpretation by a poor man's scaling analysis.

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