Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Poster: Quantum dots and wires: Preparation, characterization, optical properties and transport

HL 30.11: Poster

Montag, 31. März 2014, 17:00–20:00, P2

Electron counting in a quantum dot system — •Timo Wagner, Eddy P. Rugeramigabo, and Rolf. J. Haug — Institut für Festlörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany

We study the properties of a topgate defined quantum dot in a GaAs/AlGaAs heterostructure. Besides electronic transport measurements through the dot, we perform charge measurements with an adjacent quantum point contact (QPC) that serves as sensitive detector. These methods allow the characterisation of the dot over a wide range of tunnel couplings and electron numbers.

The analysis of the charge stability diagram reveals a region of a second capacitively coupled quantum dot. In this region electron counting experiments were performed. We are able to detect signals for tunneling rates beween Hz and kHz and for temperatures up to 1.5 K. Further we analyse the stability of the signals.