Berlin 2005 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 4: Quantenpunkte und -dr
ähte: Optische Eigenschaften I
HL 4.8: Vortrag
Freitag, 4. März 2005, 12:30–12:45, TU P-N201
Dynamics of spontaneous emission from quantum dots in microcavities — •J. Wiersig1, T. Aschenbrenner1, N. Baer1, M. Lorke1, P. Gartner1, F. Jahnke1, M. Benyoucef2, P. Michler2, M. Schwab3, H. Kurtze3, M. Bayer3 und A. Forchel4 — 1Institut für Theoretische Physik, Universität Bremen, 28334 Bremen — 2Universität Stuttgart — 3Universität Dortmund — 4Universität Würzburg
Controlling the spontaneous emission from semiconductor quantum dots by optical microcavities is important for many applications [1] such as microlasers and single-photon sources. Starting from a fully quantum mechanical theory for the microscopic dynamics of photons, electrons and holes in the coupled system of quantum dots, wetting layer, and microcavity we study the spontaneous emission dynamics. Numerical simulations for (In,Ga)As quantum dots embedded in a three-dimensional micropillar cavity show an enhancement of spontaneous emission due to the Purcell effect as the pillar diameter is varied from 6 to 2 micrometer. The computed time-resolved photoluminescence intensity shows a clear nonexponential decay in agreement with experimental data.
[1] P. Lodahl et al., Nature 430, 654-657 (2004)