Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.8: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

State Dependent Full Counting Statistics and Statistics of State Changes in a Quantum Dot — •Ansgar Pernice and Walter T. Strunz — Physikalisches Institut der Universität Freiburg, Herrmann-Herder-Str. 3, 79104 Freiburg, Germany

We consider a quantum dot in the Coulomb blockade regime, coupled to source and drain. Making use of the quantum jump representation of the density operator, we derive a state dependent formula for the full counting statistics (FCS) of electrons entering the quantum dot. In the steady state our result reduces to the one obtained by Bagrets and Nazarov [1] as well as de Jong [2]. Furthermore, we investigate the "Full Statistics of State Changes" on the dot. Remarkably, for this novel quantity an analytical expression can be found in the time domain which turns out to be highly sensitive to the coupling symmetry of the quantum dot to the leads.

[1] D.A. Bagrets and Yu.V. Nazarov. Full Counting Statistics of Charge Transfer in Coulomb Blockade Systems. Phys. Rev. B, 67(8):085316, 2003.

[2] M.J.M. de Jong. Distribution of transmitted charge through a double-barrier junction. Phys. Rev. B, 54(11):8144-8149,1996.