Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 49: Ultrafast Phenomena
HL 49.1: Vortrag
Mittwoch, 28. März 2012, 09:30–09:45, EW 202
Intra-excitonic extreme nonlinear optics — •Martin Teich1, Martin Wagner1, Dominik Stehr1, Harald Schneider1, Manfred Helm1, Sangam Chatterjee2, Hyatt Gibbs3, and Galina Khitrova3 — 1Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden — 2Faculty of Physics and Material Sciences Center, Philipps University, Renthof 5, 35032 Marburg — 3University of Arizona, 1630 East University Boulevard, Tucson, Arizona 85721 USA
A fundamental problem in light-matter interaction is the coupling of an intense, monochromatic electromagnetic wave with a quantum mechanical two-level system. One effect related to this is the Autler-Townes or AC Stark effect. Originally observed and described in molecular spectroscopy the effect refers to a splitting of an energy level that is resonantly coupled via intense radiation to an adjacent level, i.e. the states get "dressed" by the light-matter interaction. We investigate this effect using a free-electron laser (FEL) driven intra-excitonic transition between the 1s and 2p states in a semiconductor multiple quantum well [1]. We have observed distinct intensity- and wavelength-dependent Rabi sidebands of the heavy-hole hh(1s) exciton line when the FEL was tuned around the 1s-2p transition. We also present measurements at higher electric fields exploring the regime beyond the rotating-wave approximation.
[1] M. Wagner, H. Schneider, D. Stehr, S. Winnerl, A. M. Andrews, S. Schartner, G. Strasser, and M. Helm, Phys. Rev. Lett. 105, 167401 (2010).