Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 2: Ultrafast phenomena
HL 2.5: Vortrag
Montag, 11. März 2013, 10:30–10:45, H2
Manipulating intraexcitonic transitions in quantum wells — •Sangam Chatterjee1, William D. Rice2,3, Junichiro Kono2,3, Sabine Zybell4,5, Stephan Winnerl4, Jayeeta Bhattacharyya4, Harald Schneider4, Manfred Helm4,5, Benjamin Ewers1, Alexey Chernikov1, Martin Koch1, Hyatt M. Gibbs6, Galina Khitrova6, Lukas Schneebeli1, Benjamin Breddermann1, Mackillo Kira1, and Stephan W. Koch1 — 1Faculty of Physics, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — 2Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA — 3Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA — 4Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, D-01314 Dresden, Germany — 5Technische Universität Dresden, 01062 Dresden, Germany — 6College of Optical Science, University of Arizona, Tucson, Arizona 85721-0094, USA
We manipulate a 1s excitonic population in (GaIn)As quantum wells at cryogenic temperatures with free-electron laser (FEL) pulses tuned to the 1s-2p transition energy of the sample. The FEL induces strong emission at the 2s exciton seemingly invoking a transition which is forbidden in atomic systems due to selection rules. A microscopic many-body theory explains the experimental observations as a Coulomb-induced mixing of the 2s and 2p states, yielding an effective transition between the 1s and 2s populations making this observation a manifestation of the many-body nature of the excitonic system.