title: Blocking transport resonances via Kondo many-body entanglement in quantum dots.
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.
authors.affiliation: Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Niklas
authors.affiliation: Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: Sergey
authors.initials: S
authors.lastname: Smirnov
authors.affiliation: Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: Davide
authors.initials: D
authors.lastname: Mantelli
authors.affiliation: Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Margańska
authors.affiliation: Institut Néel, CNRS and Université Grenoble Alpes, 38042 Grenoble, France.
authors.forename: Ngoc-Viet
authors.initials: NV
authors.lastname: Nguyen
authors.affiliation: Institut Néel, CNRS and Université Grenoble Alpes, 38042 Grenoble, France.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wernsdorfer
authors.affiliation: Institut Néel, CNRS and Université Grenoble Alpes, 38042 Grenoble, France.|INAC-SPSMS, CEA and Université Grenoble Alpes, 38054 Grenoble, France.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Cleuziou
authors.affiliation: Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: Milena
authors.initials: M
authors.lastname: Grifoni