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

Michael Niklas, Sergey Smirnov, Davide Mantelli, Magdalena Margańska, Ngoc-Viet Nguyen, Wolfgang Wernsdorfer, Jean-Pierre Cleuziou and Milena Grifoni ()
Additional contact information
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
Milena Grifoni: Institute for Theoretical Physics, University of Regensburg

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: 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.

Date: 2016
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/ncomms12442 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12442

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/ncomms12442

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().