Full counting statistics of Kondo-type tunneling in a quantum dot: Fluctuation effects of the slave-boson field

Article

关键词: HANBURY-BROWN;    SHOT-NOISE;    EQUILIBRIUM;    TRANSPORT;   

DOI  :  10.1103/PhysRevB.84.235408

来源: SCIE

【 摘 要 】

We study the full counting statistics (FCS) of electron tunneling through a multiterminal quantum dot in the Kondo regime within the slave-boson mean-field theory. By employing the method of Gogolin and Komnik for calculating the FCS generating function based on the nonequilibrium Green's function [Phys. Rev. B 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 a 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 autocorrelation and a positive current cross-correlation.

【 授权许可】

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