Tunable Kondo physics in a carbon nanotube double quantum dot

We investigate a tunable two-impurity Kondo system in a strongly correlated carbon nanotube double quantum dot, accessing the full range of charge regimes. In the regime where both dots contain an unpaired electron, the system approaches the two-impurity Kondo model. At zero magnetic field the inter...

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Bibliographic Details
Published in:Physical review letters 2012-10, Vol.109 (15), p.156804-156804, Article 156804
Main Authors: Chorley, S J, Galpin, M R, Jayatilaka, F W, Smith, C G, Logan, D E, Buitelaar, M R
Format: Article
Language:English
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Summary:We investigate a tunable two-impurity Kondo system in a strongly correlated carbon nanotube double quantum dot, accessing the full range of charge regimes. In the regime where both dots contain an unpaired electron, the system approaches the two-impurity Kondo model. At zero magnetic field the interdot coupling disrupts the Kondo physics and a local singlet state arises, but we are able to tune the crossover to a Kondo screened phase by application of a magnetic field. All results show good agreement with a numerical renormalization group study of the device.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.109.156804