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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Niklas M,Smirnov S,Mantelli D,Margańska M,Nguyen NV,Wernsdorfer W,Cleuziou JP,Grifoni Mdoi
10.1038/ncomms12442subject
Has Abstractpub_date
2016-08-16 00:00:00pages
12442issn
2041-1723pii
ncomms12442journal_volume
7pub_type
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