Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 31: Poster I: Devices, Quantum Dots and Quantum Wires

HL 31.27: Poster

Dienstag, 23. März 2010, 18:30–20:30, Poster D1

Temperature dependent study of counting statistics of electron transport through a quantum dot — •Nandhavel Sethubalasubramanian, Lukas Fricke, Christian Fricke, Frank Hohls, and Rolf J Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover, Germany

Study of fluctuations in current through a semiconductor device provides information about the transport dynamics of the charges involved in transport through the device. The fluctuations are indirectly and discretely measurable using Quantum Point Contacts as charge detectors. Full counting statistics of mean, variance and higher moments are determined, which provide new information about the system. The work to be presented investigates the effects of temperature and asymmetric tunneling rates across the dot and the evolution of the counting statistics due to these effects. The device under investigation is fabricated through local anodic oxidation on a GaAs/AlGaAs heterostructure. The current study also investigates the statistics of transport through the dot, due to excited electrons.