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19 April 2024 |
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Nonequilibrium Singlet-Triplet Kondo Effect in Carbon Nanotubes | | J. Paaske
; A. Rosch
; P. Woelfle
; N. Mason
; C. M. Marcus
; J. Nygard
; | | Date: |
24 Feb 2006 | | Subject: | Strongly Correlated Electrons | | Abstract: | The 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. | | Source: | arXiv, cond-mat/0602581 | | Services: | Forum | Review | PDF | Favorites | |
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