Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 36: Quantenpunkte und -dr
ähte: Optische Eigenschaften III
HL 36.2: Talk
Monday, March 7, 2005, 10:15–10:30, TU P164
Strong coupling in a quantum dot microcavity system — •Carolin Hofmann1, Johann Peter Reithmaier1, Grzegorz Sek1,2, Andreas Löffler1, Silke Kuhn1, Stephan Reitzenstein1, Leonid Keldysh3, Vladimir Kolakovskii4, Tom Reinecke5, and Alfred Forchel1 — 1Technische Physik, Universität Würzburg, Am Hubland, D-97074 Würzburg — 2Institute of Physics, Wrocław University of Technology, 50-370 Wrocław, Poland — 3Lebedev Physical Institute, Russian Academy of Science, 119991 Moscow, Russia — 4Institute for Solid State Physics, Russian Academy of Science, 142432 Chernogolovka, Russia — 5Naval Research Laboratory, Washington, DC 20375, USA
Pronounced cavity quantum electrodynamics (cQED) effects are observed in a structure consisting of quantum dots embedded in a high quality micropillar cavity. cQED distinguishes between the weak and the strong coupling regime, depending on the coupling strength between the atom-like emitter and the electromagnetic modes of the cavity. Weak coupling corresponds to an irreversible process in which the quantum mechanical emitter-photon coupling leads to the well known Purcell-Effect. Strong coupling is related to a reversible energy exchange between the emitter and the cavity mode. It will be shown that high quality AlAs/GaAs micropillar cavities containing a low density GaInAs quantum dot layer allow one to observe weak as well as strong coupling effects in semiconductor structures. These studies have allowed the first observation of strong coupling characterized by vacuum Rabi splitting in a solid state system.