1 July 1992 Magneto-optical studies of highly excited quantum wells (Invited Paper)
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Abstract
High excitation luminescence spectra from a homogeneous electron-hole system have been investigated in undoped strained InxGa1-xAs/GaAs and unstrained InxGa1-xAs/InP quantum wells in magnetic fields up to 12 T. Clear excitonic effects are observed in the optical spectra of neutral, dense magnetoplasmas in the In0.53Ga0.47As/InP quantum well at low temperatures. A direct evidence that electrons and holes from the N-th Landau levels bind into magnetoexcitons is the suppression of the density dependence of transition energies between the uppermost occupied (je equals jh equals N) Landau levels in the range of filling factors N < (nu) /2 < N + 1. The effect disappears with increasing temperature. Good agreement between experimental results and theoretical calculations is achieved by including both the inter-Landau-level coupling and screening effects. For the dense (n > 1012 cm-2) magnetoplasma with electron temperature of the order of the cyclotron energy, the Landau level splitting is described within the framework of a simple plasma approximation. The renormalization of the reduced effective mass has been carefully measured.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vladimir D. Kulakovskii, "Magneto-optical studies of highly excited quantum wells (Invited Paper)", Proc. SPIE 1678, Spectroscopic Characterization Techniques for Semiconductor Technology IV, (1 July 1992); doi: 10.1117/12.60465; https://doi.org/10.1117/12.60465
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