Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-11-27
PhysRevB.84.235408 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 3 figures, to be published
Scientific paper
We study the full counting statistics (FCS) of electron tunneling through a multi-terminal quantum dot in the Kondo regime within the slave-boson mean field theory. By employing the A.O. Gogolin and A. Komnik's method of calculating the FCS generating function based on the nonequilibrium Green's function [Phys. Rev. B {\bf 73}, 195301 (2006)], we obtain the counting field $\lambda$-dependent self-consistent equations for the mean values of the slave-boson fields and the explicit expression for the derivative of the adiabatic potential of the system with respect to the counting fields. Performing perturbative expansion to the first order of $\lambda$, we find an extra contribution to the shot noise due to the bias-induced Bose field fluctuation, and then confirm that the nonequilibrium particle number fluctuation plays an important role in the current noise of the Kondo dot: enhancement of the current auto-correlation and a positive current cross-correlation.
Ding Guo-Hui
Dong Bing
Lei Xing-Lin
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