Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: HL Poster II

HL 35.51: Poster

Mittwoch, 3. April 2019, 17:30–20:00, Poster E

Transport Properties of Self-Assembeld InAs Double Quantum Dots — •Felix Opiela, Jan. K Kühne, and Rolf. J Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, D-30167 Hannover, Germany

This work focuses on the analysis of transport measurements with variable parameters such as the magnetic field or the temperature, on self-assembeld InAs double quantum dots which are embedded in a GaAs/AlGaAs heterostructure. Due to the different size of the middle tunneling barrier (3/5/7nm), we were able to differentiate between a weak coupling and a strong coupling [1]. Likewise we examined a dependency of the thermal broadend fermi-edge with the expanded molecular resonant state of the coupled quantum dot[2].In the I/V measurements a decreasing amplitude and a thermal broadened peak width were observed. Thus leading to the analysis of a phononic contribution and a detailed examination of the thermal dependency at low temperatures. In addition to that we analyzed the different samples in a varying magnetic field in the range of 0 to 14 Tesla. Parallel as well as perpendicular magnetic field orientation were analyzed in respect to the current flow.

[1] W. G. van der Wiel et.al. Rev.Mod.Phys. 75,1 (2002)

[2] G. Kiesslich Phys. Rev. Lett. 99,206602 (2007)