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HL: Fachverband Halbleiterphysik

HL 43: Quantum dots and wires: Optical properties II

HL 43.8: Vortrag

Donnerstag, 28. Februar 2008, 16:00–16:15, EW 201

Measuring the Correlated Photon Emission of Single Semiconductor Quantum Dots Using a Compact Femtosecond Fiber Laser — •Florian Sotier¹, Matthias Kahl¹, Tobias Hanke¹, Tim Thomay¹, Katja Beha¹, Suddhasatta Mahapatra², Alexander Frey², Karl Brunner², Alfred Leitenstorfer¹, and Rudolf Bratschitsch¹ — ¹Department of Physics and Center for Applied Photonics, University of Konstanz, D-78464 Konstanz, Germany — ²Experimental Physics III, University of Würzburg, D-97074 Würzburg, Germany

We report on time-resolved microphotoluminescence and photon correlation measurements of single epitaxially-grown self-assembled CdSe/ZnSe quantum dots. The structures are excited with a modelocked Er:fiber laser which is tunable between 500 nm and 700 nm. In contrast to previous works, which used ultraviolet light for excitation, we are able to resonantly pump low-lying excited states in individual quantum dots. We present time-resolved photoluminescence measurements on single dots revealing the spontaneous emission decay from the different finestructure split states. With a Hanbury-Brown and Twiss setup we are able to demonstrate photon antibunching of these nanoemitters. We will compare the time-resolved data with cw measurements of the photon statistics.