Magnetically Tuned Kondo Effect in a Molecular Double Quantum Dot: Role of the Anisotropic ExchangeClick to copy article linkArticle link copied!
- Peter ZalomPeter ZalomDepartment of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech RepublicInstitute of Physics, The Czech Academy of Sciences, Na Slovance 2, CZ-18221 Praha 8, Czech RepublicMore by Peter Zalom
- Joeri de BruijckereJoeri de BruijckereKavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The NetherlandsMore by Joeri de Bruijckere
- Rocco GaudenziRocco GaudenziKavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The NetherlandsMax Planck Institute for the History of Science, Boltzmannstrasse 22, 14195 Berlin, GermanyMore by Rocco Gaudenzi
- Herre S. J. van der ZantHerre S. J. van der ZantKavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The NetherlandsMore by Herre S. J. van der Zant
- Tomáš NovotnýTomáš NovotnýDepartment of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech RepublicMore by Tomáš Novotný
- Richard Korytár*Richard Korytár*E-mail: [email protected]Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech RepublicMore by Richard Korytár
Abstract

We investigate theoretically and experimentally the singlet–triplet Kondo effect induced by a magnetic field in a molecular junction. Temperature-dependent conductance, G(T), is calculated by the numerical renormalization group, showing a strong imprint of the relevant low-energy scales, such as the Kondo temperature, exchange, and singlet–triplet splitting. We demonstrate the stability of the singlet–triplet Kondo effect against weak spin anisotropy, modeled by an anisotropic exchange. Moderate spin anisotropy manifests itself by lowering the Kondo plateaus, causing the G(T) to deviate from a standard temperature dependence, expected for a spin-half Kondo effect. We propose this scenario as an explanation for anomalous G(T), measured in an organic diradical molecule coupled to gold contacts. We uncover certain new aspects of the singlet–triplet Kondo effect, such as coexistence of spin-polarization on the molecule with Kondo screening and nonperturbative parametric dependence of an effective magnetic field induced by the leads.
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This article is cited by 5 publications.
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, 125001. https://doi.org/10.1088/2399-6528/ab5b82
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