Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 46: Quantum Dots and Wires: Transport
HL 46.8: Vortrag
Mittwoch, 24. März 2010, 16:00–16:15, H17
High-order cumulants in the counting statistics of asymmetric quantum dots — •Christian Fricke, Frank Hohls, Nandhavel Sethubalasubramanian, Lukas Fricke, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany
Current fluctuations in mesoscopic systems allow to obtain information on transport that is not accessible from the average current alone. Further understanding in electron transport can be gained from higher moments of the transport statistics. With the use of a quantum point contact as a non-invasive charge detector the full counting statistic (FCS) is now experimentally accessible in quantum dot physics. These techniques made the extraction of high-order cumulants possible, revealing an oscillating behavior as function of integration time. The theoretical treatment has shown that these oscillations are a universally expected phenomenon for most physical systems and that in quantum dots they should show up prominently as function of the barrier asymmetry. We carried out FCS measurements on a quantum dot with tunable barrier asymmetry and present the asymmetry dependence of high-order cumulants up to the 15th order.