Le Journal de Physique IV 03 (1993) C5-59-C5-62
Quantum well excitonic polaritons : coupling of quantum well excitons to electromagnetic waveguide modesS. JORDA
Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
The calculated dispersion curves of excitonic polaritons in GaAs quantum wells provide up to now not even a qualitative explanation for the time-of-flight experiments by Ogawa et al. [Phys. Rev. Lett. 64, 796 (1990)] which clearly show the existence of a mode with photon-like dispersion above the excitonic resonance. We show that this discrepancy can be removed by realizing that the QW constitutes a dielectric waveguide. The solution of the coupled system consisting of the exciton and the electromagnetic waveguide eigenmodes yields a drastically modified dispersion for the T and Z polariton as compared to previous calculations.
© EDP Sciences 1993