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Blocking transport resonances via Kondo many-body entanglement in quantum dots

Author

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  • Michael Niklas

    (Institute for Theoretical Physics, University of Regensburg)

  • Sergey Smirnov

    (Institute for Theoretical Physics, University of Regensburg)

  • Davide Mantelli

    (Institute for Theoretical Physics, University of Regensburg)

  • Magdalena Margańska

    (Institute for Theoretical Physics, University of Regensburg)

  • Ngoc-Viet Nguyen

    (Institut Néel, CNRS and Université Grenoble Alpes)

  • Wolfgang Wernsdorfer

    (Institut Néel, CNRS and Université Grenoble Alpes)

  • Jean-Pierre Cleuziou

    (Institut Néel, CNRS and Université Grenoble Alpes
    INAC-SPSMS, CEA and Université Grenoble Alpes)

  • Milena Grifoni

    (Institute for Theoretical Physics, University of Regensburg)

Abstract

Many-body entanglement is at the heart of the Kondo effect, which has its hallmark in quantum dots as a zero-bias conductance peak at low temperatures. It signals the emergence of a conducting singlet state formed by a localized dot degree of freedom and conduction electrons. Carbon nanotubes offer the possibility to study the emergence of the Kondo entanglement by tuning many-body correlations with a gate voltage. Here we show another side of Kondo correlations, which counterintuitively tend to block conduction channels: inelastic co-tunnelling lines in the magnetospectrum of a carbon nanotube strikingly disappear when tuning the gate voltage. Considering the global SU(2) ⊗ SU(2) symmetry of a nanotube coupled to leads, we find that only resonances involving flips of the Kramers pseudospins, associated to this symmetry, are observed at temperatures and voltages below the corresponding Kondo scale. Our results demonstrate the robust formation of entangled many-body states with no net pseudospin.

Suggested Citation

  • Michael Niklas & Sergey Smirnov & Davide Mantelli & Magdalena Margańska & Ngoc-Viet Nguyen & Wolfgang Wernsdorfer & Jean-Pierre Cleuziou & Milena Grifoni, 2016. "Blocking transport resonances via Kondo many-body entanglement in quantum dots," Nature Communications, Nature, vol. 7(1), pages 1-9, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12442
    DOI: 10.1038/ncomms12442
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