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Statut |
Confirmé |
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Série |
LPENS-MDQ |
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Domaines |
cond-mat |
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Date |
Lundi 23 Fevrier 2015 |
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Heure |
13:30 |
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Institut |
LPA |
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Salle |
salle 236 au 29 rue d’Ulm |
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Nom de l'orateur |
Winkelmann |
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Prenom de l'orateur |
Clemens |
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Addresse email de l'orateur |
clemens [dot] winkelmann [at] neel [dot] cnrs [dot] fr |
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Institution de l'orateur |
Institut Néel |
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Titre |
Quantized current in a single quantum level turnstile |
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Résumé |
Single electron pumps are foreseen to set the new quantum standard for current, thereby closing the quantum metrology triangle. During the past decade, significant experimental and theoretical effort has been spent on the seek of quantum current generators in variety of mesoscopic systems. We demonstrate quantized charge current in superconductor - quantum dot - superconductor hybrid turn-stiles. The quantum dot devices are formed by single gold nano-particles inserted in electromigrated aluminium constrictions. Charging energies and single level spacings are much larger than the superconducting gap, which allows charge pumping through a single electron level. The turnstiles are operated at pumping frequencies up to 200 MHz and reach an accuracy of 1%. We discuss the accuracy limitation and show that the large energy level spacing protects the device from thermally induced errors. |
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Numéro de preprint arXiv |
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Commentaires |
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Fichiers attachés |
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