Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 61: Quantum Dots and Wires: Transport Properties

HL 61.3: Talk

Wednesday, March 9, 2016, 15:15–15:30, H16

Noise and Transport through self-assembled InAs Quantum Dot Systems — •Jan K. Kühne and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover, Germany

We present transport and shot noise measurements through self-assembled single and double quantum dots of InAs at very low temperatures. Quantum effects like the Fermi-edge singularity (FES) lead to peaks in the current and to enhanced suppression of the shot noise in our systems [1]. Further we observe different behavior in the IV - characteristics and the Fano factor depending on the transport direction, due to the asymmetry of the quantum dot and the corresponding change in tunneling rates of the collector and emitter. Especially we compare the different influence of an applied magnetic field.

[1] N. Ubbelohde, K. Roszak, F. Hohls, N. Maire, R. J. Haug, and T. Novotny, Sci. Rep.2,374(2012)