Abstract
The important influence of many-body Coulomb interactions on both the magnitude and dynamics of the nonlinear optical response of 2D excitons in high-quality GaAs quantum wells (QWs) has been demonstrated by many recent experimental and theoretical studies. Whereas this Coulomb coupling shoud be negligible for excitons excited in different wells of a multiple QW (MQW) structure for barrier thicknesses >10-15 nm, efficient inter-well exciton/exciton coupling via reemitted photons and light propagation effects has been recently predicted for very high quality samples. Here, we present dephasing measurements on excitons in MBE-grown GaAs MQW Bragg (and anti-Bragg) structures which consist of N identical QWs (width 20 nm, barrier material Al03Ga0.7As) with an equidistant separation d equal to one half (one quarter) of the heavy-hole exciton resonance wavelength λ in the medium, the experiments reveal effective dipole-dipole interactions between excitons excited in different wells mediated by the exchange of transverse photons.
© 1996 Optical Society of America
PDF ArticleMore Like This
J. Kuhl, M. Hübner, T. Stroucken, A. Knorr, S.W. Koch, R. Hey, and K. Ploog
WC.4 International Conference on Ultrafast Phenomena (UP) 1996
M. Hübner, J. Kuhl, B. Grote, T. Stroucken, S. Haas, A. Knorr, and S.W. Koch
QFB2 International Quantum Electronics Conference (IQEC) 1998
J. Kuhl, M. Hübner, T. Stroucken, B. Grote, A. Knorr, S.W. Koch, R. Hey, and K. Ploog
QWB.5 Quantum Optoelectronics (QOE) 1997