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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.62: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Time-resolved electroluminescence measurement setup for single quantum dots — •J. Zimmer, P. Asshoff, H. Füser, H. Flügge, W. Löffler, M. Hetterich, and H. Kalt — Institut für Angewandte Physik, Universität Karlsruhe (TH), and DFG Center for Functional Nanostructures, CFN, D-76128 Karlsruhe

We describe a time-correlated single-photon counting setup for the analysis of the spin-injection process in spin-injection light-emitting diodes (spin-LEDs). We are able to measure the temporal electroluminescence polarization dynamics of the quantum dot ensemble and even single dots. To get optical access to single quantum dots, we use gold submicron apertures located on top of the spin-LEDs. The electroluminescence polarization dynamics of the quantum dots exhibit remarkable characteristics. We relate this to certain non-equilibrium effects in the device.