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HL: Fachverband Halbleiterphysik
HL 85: Poster Session II
HL 85.91: Poster
Donnerstag, 17. März 2011, 18:00–21:00, P4
Transport spectroscopy of many-particle hole states in InAs quantum dots coupled to a two-dimensional hole gas — •Andreas Beckel1, Bastian Marquardt1, Martin Geller1, Axel Lorke1, Tobias Nowozin2, Andreas Marent2, and Dieter Bimberg2 — 1Faculty of Physics, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
Interactions between self-organized InAs quantum dots (QD) and a two-dimensional hole gas (2DHG) can be used to probe the charge state in future memory applications [1]. We demonstrate that the conductance of the 2DHG is a very sensitive tool, also for time-resolved measurements. This enables us to measure the tunneling dynamics between the 2DHG and the QDs [2] for very weakly coupled QDs exhibiting tunneling times in the order of several seconds. The time-resolved spectroscopy makes it possible to measure the density of states in the QD ensemble with single charge resolution up to 75 K. These results demonstrate the feasibility of high temperature read-out of the quantum states in self-assembled QDs using a 2DHG.
[1] A. Marent et al., Appl. Phys. Lett. 95, 242114 (2009).
[2] B. Marquardt et al., Appl. Phys. Lett. 95, 22113, (2009).