Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots

Abstract

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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• Tunable Supercurrent Through Semiconductor Nanowires
• Supercurrent reversal in quantum dots
• Quantum supercurrent transistors in carbon nanotubes
• Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot
• Kondo physics in tunable semiconductor nanowire quantum dots

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