Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Transport: Fluctuations and Noise

TT 21.1: Hauptvortrag

Dienstag, 24. März 2009, 14:00–14:30, HSZ 304

Correlated charge detection in quantum dots — •Klaus Ensslin — ETH Zurich, Switzerland

Quantum point contacts placed close to quantum dots can be used as charge detectors with time resolution. This way it is possible to measure the statistics of charge transport through quantum structures or the interference of individual electrons. If the quantum dot or double dot is probed by two charge detectors the detector signals may be correlated or anti-correlated depending on the locations between which a single electron is transported. This allows to fully characterize the tunneling processes of electrons in a double dot systems. For quantum dots tuned off resonance this method allows to also measure co-tunneling rates. These experiments are performed in standard n-type AlGaAs heterostructures, but also in p-type material, InAs nanowire quantum dots as well as in graphene quantum structures.