Local electrical tuning of the nonlocal signals in a Cooper pair splitter

A Cooper pair splitter consists of a central superconducting contact, S, from which electrons are injected into two parallel, spatially separated quantum dots (QDs). This geometry and electron interactions can lead to correlated electrical currents due to the spatial separation of spin-singlet Coope...

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Bibliographic Details
Published in:arXiv.org 2014-09
Main Authors: Fülöp, G, d'Hollosy, S, Baumgartner, A, Makk, P, Guzenko, V A, Madsen, M H, Nygård, J, Schönenberger, C, Csonka, S
Format: Article
Language:English
Subjects:
Cooper pairs
Correlation
Couplings
Electric contacts
Quantum dots
Quantum theory
Quantum transport
Resistance
Splitting
Tuning
Online Access:Get full text
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Summary:A Cooper pair splitter consists of a central superconducting contact, S, from which electrons are injected into two parallel, spatially separated quantum dots (QDs). This geometry and electron interactions can lead to correlated electrical currents due to the spatial separation of spin-singlet Cooper pairs from S. We present experiments on such a device with a series of bottom gates, which allows for spatially resolved tuning of the tunnel couplings between the QDs and the electrical contacts and between the QDs. Our main findings are gate-induced transitions between positive conductance correlation in the QDs due to Cooper pair splitting and negative correlations due to QD dynamics. Using a semi-classical rate equation model we show that the experimental findings are consistent with in-situ electrical tuning of the local and nonlocal quantum transport processes. In particular, we illustrate how the competition between Cooper pair splitting and local processes can be optimized in such hybrid nanostructures.
ISSN:2331-8422
DOI:10.48550/arxiv.1409.0818