Berlin 2012 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 44: Poster Session: Quantum Dots and Wires - Transport & Optical Properties
HL 44.9: Poster
Tuesday, March 27, 2012, 09:30–12:30, Poster D
Many-particle electron dynamics in InAs self-assembled quantum dots — •A. Kurzmann1, A. Beckel1, B. Marquardt1, M. Geller1, B. Baxevanis2, D. Pfannkuche2, A. D. Wieck3, D. Reuter3, and A. Lorke1 — 1Faculty of Physics and CeNIDE, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany — 2Institute for Theoretical Physics, University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany — 3Chair for Applied Solid State Physics, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany
Visionary quantum information processing (QIP) requires the access to excited, i. e. non-equilibrium, charge or spin states to serve as one building block for the needed qubits. With their strong confinement, self-assembled quantum dots (QDs) are ideal candidates for qubits operating at above liquid helium temperatures. We have demonstrated an all-electrical preparation and read out technique of excited many-particle states using a nearby two-dimensional electron gas [1] as charge sensing detector [2]. This new technique is used here to investigate the dynamics of excited electron states in InAs/GaAs QDs evolving from non-equilibrium towards equilibrium configuration. These time-resolved measurements enables separating the many-particle spectrum into the contributions from different equilibrium and excited states and serve as a starting point for further investigations on the spin dynamics in an all-electrical measurement scheme.
[1] B. Marquardt et al., Nat. Commun. 2, 209 (2011).
[2] B. Marquardt et al., Appl. Phys. Lett. 95, 022113 (2009).