Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-12-07
Phys. Rev. B 75, 155321 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 4 figures, revised version, new title
Scientific paper
We investigate the influence of an electromagnetic environment, characterized by a finite impedance $Z(\omega)$, on the Kondo effect in quantum dots. The circuit voltage fluctuations couple to charge fluctuations in the dot and influence the spin exchange processes transferring charge between the electrodes. We discuss how the low-energy properties of a Kondo quantum dot subject to dynamical Coulomb blockade resemble those of Kondo impurities in Luttinger liquids. Using previous knowledge based on the bosonization of quantum impurity models, we show that low-voltage conductance anomalies appear at zero temperature. The conductance can vanish at low temperatures even in presence of a screened impurity spin. Moreover, the quantitative determination of the corresponding Kondo temperature depends on the full frequency-dependent impedance of the circuit. This is demonstrated by a weak-coupling calculation in the Kondo interaction, taking into account the full distribution $P(E)$ of excited environmental modes.
Andergassen Sabine
Feinberg Denis
Florens Serge
Simon Pascal
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