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Niklas M, Smirnov S, Mantelli D, et al. Blocking transport resonances via Kondo many-body entanglement in quantum dots. Nat Commun. 2016;7:12442doi: 10.1038/ncomms12442.
Niklas, M., Smirnov, S., Mantelli, D., Margańska, M., Nguyen, N. V., Wernsdorfer, W., Cleuziou, J. P., & Grifoni, M. (2016). Blocking transport resonances via Kondo many-body entanglement in quantum dots. Nature communications, 712442. https://doi.org/10.1038/ncomms12442
Niklas, Michael, et al. "Blocking transport resonances via Kondo many-body entanglement in quantum dots." Nature communications vol. 7 (2016): 12442. doi: https://doi.org/10.1038/ncomms12442
Niklas M, Smirnov S, Mantelli D, Margańska M, Nguyen NV, Wernsdorfer W, Cleuziou JP, Grifoni M. Blocking transport resonances via Kondo many-body entanglement in quantum dots. Nat Commun. 2016 Aug 16;7:12442. doi: 10.1038/ncomms12442. PMID: 27526870; PMCID: PMC4990698.
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Nat Commun. 2016 Aug 16;7:12442. doi: 10.1038/ncomms12442.

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

Nature communications

Michael Niklas, Sergey Smirnov, Davide Mantelli, Magdalena Margańska, Ngoc-Viet Nguyen, Wolfgang Wernsdorfer, Jean-Pierre Cleuziou, Milena Grifoni

Affiliations

  1. Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
  2. Institut Néel, CNRS and Université Grenoble Alpes, 38042 Grenoble, France.
  3. INAC-SPSMS, CEA and Université Grenoble Alpes, 38054 Grenoble, France.

PMID: 27526870 PMCID: PMC4990698 DOI: 10.1038/ncomms12442

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.

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