Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 31: Poster II

HL 31.17: Poster

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

Full Counting Statistics of Electron Transport trough Quantum Dots — •Ingmar Neumann, Christian Fricke, Frank Hohls, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, D-30167 Hannover, Germany

We study electric transport properties of quantum dots (QDs) by means of a quantum point contact (QPC). These devices are made of GaAs/AlGaAs-heterostructures containing a two-dimensional electron system. The QD and the QPC are defined with an atomic force microscope using local anodic oxidation. Charge fluctuations on the dot result in current fluctuations trough the QPC, this provides a noninvasive way of charge detection. We measure the timeresolved QPC current, which allows us to detect single electron tunneling events onto and of the dot. The full counting statistics (FCS) of the tunneling events provides additional information on the electron transport through the dot. Also, characteristic tunneling times for our systems are yielded, varying parameters such as gate-voltages or magnetic field.