Nonequilibrium Singlet-Triplet Kondo Effect in Carbon Nanotubes

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dc.creatorPaaske, J.
dc.creatorRosch, A.
dc.creatorWoelfle, P.
dc.creatorMason, N.
dc.creatorMarcus, C. M.
dc.creatorNygard, J.
dc.date2006-02-24
dc.date.accessioned2026-07-07T07:01:56Z
dc.date.available2026-07-07T07:01:56Z
dc.descriptionThe Kondo-effect is a many-body phenomenon arising due to conduction electrons scattering off a localized spin. Coherent spin-flip scattering off such a quantum impurity correlates the conduction electrons and at low temperature this leads to a zero-bias conductance anomaly. This has become a common signature in bias-spectroscopy of single-electron transistors, observed in GaAs quantum dots as well as in various single-molecule transistors. While the zero-bias Kondo effect is well established it remains uncertain to what extent Kondo correlations persist in non-equilibrium situations where inelastic processes induce decoherence. Here we report on a pronounced conductance peak observed at finite bias-voltage in a carbon nanotube quantum dot in the spin singlet ground state. We explain this finite-bias conductance anomaly by a nonequilibrium Kondo-effect involving excitations into a spin triplet state. Excellent agreement between calculated and measured nonlinear conductance is obtained, thus strongly supporting the correlated nature of this nonequilibrium resonance.
dc.description21 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0602581
dc.identifierhttp://arxiv.org/abs/cond-mat/0602581
dc.identifierNature Physics, vol. 2, p.460 - 464 (2006)
dc.identifierdoi:10.1038/nphys340
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108435
dc.subjectStrongly Correlated Electrons
dc.titleNonequilibrium Singlet-Triplet Kondo Effect in Carbon Nanotubes
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