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HL: Fachverband Halbleiterphysik

HL 31: Poster II

HL 31.24: Poster

Dienstag, 26. Februar 2008, 16:30–19:00, Poster D

Diagrammatic Technique for Frequency-dependent Full Counting Statistics — •D. Marcos¹, C. Emary², T. Brandes², and R. Aguado¹ — ¹Departamento de Teoría de la Materia Condensada. Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco 28049. Madrid, Spain — ²Institut für Theoretische Physik, Hardenbergstr. 36, TU Berlin, D-10623 Berlin Germany

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)