Full counting statistics for the Kondo dot in the unitary limit

Abstract

We calculate the charge transfer probability distribution function $\chi (\lambda )$ for the Kondo dot in the strong coupling limit within the framework of the Nozières--Fermi--liquid theory of the Kondo effect. At zero temperature, the ratio of the moments $C_n$ of the charge distribution to the backscattering current $I_{\mathrm{bs}}$ follows a universal law $C_n/2I_{\mathrm{bs}}=(-1{)}^n(1+2^n)/6$. The functional form of $\chi (\lambda )$ is consistent with tunnelling of electrons and, possibly, electron pairs. We then discuss the cross-over behaviour of $\chi (\lambda )$ from weak to strong Coulomb repulsion in the underlying Anderson impurity model and relate this to the existing results. Finally, we extend our analysis to the case of finite temperatures.

5 pages, 1 eps figure

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