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D. Marcos, C. Emary, T. Brandes, and R. Aguado.
The theory of Full Counting Statistics has recently emerged as a powerful tool to fully characterize correlations in nanoscopic transport problems [1,2]. In the same way, experiments have been reported, and the new information contained in high order current cumulants has become apparent [3]. In this work, we present results for the frequency-dependent second and third currrent cumulants in a single resonant level and a double quantum dot. To this end, we have worked out a physically-interpretable diagrammatic technique, based on the density matrix approach [4] and a projectors method [5], such that only the stationary solution of the problem is needed. [1] W. Belzig, et al., Phys. Rev. B 71, 161301(R) (2005). [2] G. Kiesslich, et al., Phys. Rev. B 73, 033312 (2006). [3] S. Gustavsson et al., Phys. Rev. Lett. 96, 076605 (2006). [4] D. A. Bagrets and Yu. V. Nazarov, Phys. Rev. B 67, 085316 (2003). [5] K. W. Becker and P. Fulde, Z. Phys. B 72, 423 (1988). |
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