An excitonic model of terahertz radiation from quantum wells including the full angular momentum dependence of the valence band and exciton states and including continuum excitons is presented. The inclusion of multiple bound and continuum excitons leads to a complete model and better agreement with experimental data in the time and frequency domains. With the inclusion of the complete angular momentum dependence and continuum excitons, the model demonstrates the effect of mixing between light-hole bound excitons and the heavy-hole continuum on the generated terahertz radiation. A discontinuity in the applied field dependence of terahertz radiation frequency that appears in the experiments of Planken [Phys. Rev. Lett. 69, 3800 (1992)] can be attributed to a Fano resonance between bound light-hole excitons and the heavy-hole continuum.
© 1997 Optical Society of America
Adriaan J. Sengers and Leung Tsang, "Valence-band mixing and continuum excitons in the excitonic model for coherent terahertz radiation from quantum wells," J. Opt. Soc. Am. B 14, 1057-1065 (1997)