Magneto-optical studies of highly excited quantum wells (Invited Paper)

Vladimir D. Kulakovskii

doi:10.1117/12.60465

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1 July 1992 Magneto-optical studies of highly excited quantum wells (Invited Paper)

Vladimir D. Kulakovskii

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Proceedings Volume 1678, Spectroscopic Characterization Techniques for Semiconductor Technology IV; (1992) https://doi.org/10.1117/12.60465
Event: Semiconductors '92, 1992, Somerset, NJ, United States

Abstract

High excitation luminescence spectra from a homogeneous electron-hole system have been investigated in undoped strained In_xGa_1-xAs/GaAs and unstrained In_xGa_1-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 In_0.53Ga_0.47As/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 (j_e equals j_h 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.

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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); https://doi.org/10.1117/12.60465

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