Regensburg 2002 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 9: Optische Eigenschaften
HL 9.5: Vortrag
Montag, 11. März 2002, 16:30–16:45, H15
Enhanced Resonant Backscattering of Quantum Well Excitons — •W. Langbein1, V. Savona2, E. Runge2, and R. Zimmermann2 — 1Exp. Physik IIb, Universität Dortmund,Otto-Hahn-Str. 4, 44221 Dortmund — 2Institut für Physik der Humboldt-Universität zu Berlin, Hausvogteiplatz 5-7, 10117 Berlin
The directional coherent resonant scattering of excitons in GaAs single quantum wells is studied experimentally and theoretically [1] using light-scattering. Both the time-resolved and the time-integrated, spectrally resolved scattering is investigated. An enhancement of the scattered intensity in the back-scattering direction is found, with a spectral and temporal dynamics in quantitative agreement with theory. The intensity enhancement is rather small (<20 %), and its directional width is large due to the small localization length of quantum well exciton waves as compared to the light wavelength.
[1] V.Savona et al., Phys. Rev. B 62, R4805 (2000)