Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: Quantum dots and wires: Optical properties I

HL 12.10: Vortrag

Montag, 26. März 2007, 17:15–17:30, H17

Coulomb corrections to group velocity slow-down in quantum-dot quantum coherence — •Stephan Michael¹, Hans Christian Schneider¹, and Weng Wah Chow² — ¹Physics Department, Kaiserslautern University, P.O. Box 3049, 67653 Kaiserslautern, Germany — ²Sandia National Laboratories, Albuquerque, NM 87185-1086

Coherent effects such as electromagnetically induced transparency (EIT) and amplification without inversion (AWI) are well known in atomic few-level systems. This talk presents theoretical results on the realization of EIT and group-velocity slowdown in self organized quantum-dot systems. Many-particle effects introduce differences to the independent-particle treatment typically used for describing atomic quantum coherence. In particular, Hartree-Fock renormalizations can lead to over two orders of magnitude reduction in the predicted pump-intensity requirement for group-velocity slowdown. Results are presented for the slow-down factor and slow-down-bandwidth product in a pulsed InGaAs-GaAs quantum-dot lambda scheme, and the influence of light propagation effects is also briefly discussed.