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26 April 2024

» pubmed » pmid17930535

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Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots
T S ; -Jespersen ; J Paaske ; B M Andersen ; K Grove-Rasmussen ; H I Jørgensen ; M Aagesen ; C B Sørensen ; P E Lindelof ; K Flensberg ; J Nygård ;
Date:	21 Sep 2007
Journal:	Phys Rev Lett, 99 (12), 126603
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 \|V_{sd}\|=Delta/e markedly stronger (weaker) than the quasiparticle tunneling peaks at \|V_{sd}\|=2Delta/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 we substantiate this interpretation by a poor man’s scaling analysis.
Source:	PubMed, pmid17930535
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