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Magnetically Tuned Kondo Effect in a Molecular Double Quantum Dot: Role of the Anisotropic Exchange
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    Magnetically Tuned Kondo Effect in a Molecular Double Quantum Dot: Role of the Anisotropic Exchange
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    • Peter Zalom
      Peter Zalom
      Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech Republic
      Institute of Physics, The Czech Academy of Sciences, Na Slovance 2, CZ-18221 Praha 8, Czech Republic
      More by Peter Zalom
    • Joeri de Bruijckere
      Joeri de Bruijckere
      Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
    • Rocco Gaudenzi
      Rocco Gaudenzi
      Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
      Max Planck Institute for the History of Science, Boltzmannstrasse 22, 14195 Berlin, Germany
    • Herre S. J. van der Zant
      Herre S. J. van der Zant
      Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
    • Tomáš Novotný
      Tomáš Novotný
      Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech Republic
    • Richard Korytár*
      Richard Korytár
      Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech Republic
      *E-mail: [email protected]
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2019, 123, 18, 11917–11925
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    https://doi.org/10.1021/acs.jpcc.9b00783
    Published April 15, 2019
    Copyright © 2019 American Chemical Society

    Abstract

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    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.

    Copyright © 2019 American Chemical Society

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    This article is cited by 5 publications.

    1. Athanasios Koliogiorgos, Richard Korytár. Minimal model of inelastic tunneling of vibrating magnetic molecules on superconducting substrates. Physical Review B 2024, 110 (23) https://doi.org/10.1103/PhysRevB.110.235424
    2. Sudeshna Sen, Andrew K. Mitchell. Many-Body Quantum Interference Route to the Two-Channel Kondo Effect: Inverse Design for Molecular Junctions and Quantum Dot Devices. Physical Review Letters 2024, 133 (7) https://doi.org/10.1103/PhysRevLett.133.076501
    3. Farhana Yasmin Rahaman, Anas Akhtar, Abhijit Chandra Roy. Plasmonics Studies for Molecular Scale Optoelectronics. 2022, 121-170. https://doi.org/10.1007/978-3-030-99491-4_4
    4. Kacper Wrześniewski, Ireneusz Weymann. Time-dependent spintronic anisotropy in magnetic molecules. Physical Review B 2020, 101 (24) https://doi.org/10.1103/PhysRevB.101.245434
    5. Eugene Kogan. Poor man’s scaling and Lie algebras. Journal of Physics Communications 2019, 3 (12) , 125001. https://doi.org/10.1088/2399-6528/ab5b82

    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2019, 123, 18, 11917–11925
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpcc.9b00783
    Published April 15, 2019
    Copyright © 2019 American Chemical Society

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