Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots
T. Sand-Jespersen, J. Paaske, B. M. Andersen, K. Grove-Rasmussen, H. I. Jørgensen, M. Aagesen, C. B. Sørensen, P. E. Lindelof, K. Flensberg, J. Nygård
DOI 10.1103/PhysRevLett.99.126603 · Physical Review Letters
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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 subgap peaks at |Vsd|=Δ/e markedly stronger (weaker) than the quasiparticle tunneling peaks at |Vsd|=2Δ/e for odd (even) occupation. We attribute the enhanced Δ peak to an interplay between Kondo correlations and Andreev tunneling in dots with an odd number of spins, and we substantiate this interpretation by a poor man’s scaling analysis.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ti/Al/Ti Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.75 | Pressure not reported | unknown |
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