Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 12: Quantenpunkte und -dr
ähte: Optische Eigenschaften II

HL 12.4: Talk

Friday, March 4, 2005, 15:45–16:00, TU P-N201

Demonstration of Phonon Bottleneck in Single Quantum Dot Molecules — •Ruth Oulton¹, Gerhard Ortner¹, Hannes Kurtze¹, Matthias Schwab¹, Dmitri Yakovlev¹, Manfred Bayer¹, Simon Fafard², Zbig Wasilewski², and Pawel Hawrylak² — ¹Experimentelle Physik II, Universität Dortmund, D-44221 Dortmund, Germany — ²Institute for Microstructural Sciences, National Research Council, Ottawa, K1A 0R6, Canada

The dependence of emission intensity from the tunnel split exciton states in InAs/GaAs quantum dot molecules on their energy separation is studied. Even at the smallest excitation powers luminescence from both states appears in the spectra, when the splitting is smaller than the optical phonon energy. When the splitting becomes larger, emission from the antibonding states is observed only when the systems are optically pumped resulting in Pauli-blocking effects. This demonstrates the existence of an acoustic phonon relaxation bottleneck.