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Action d'un champ magnétique sur les trions excitoniques dans les puits quantiques de semi-conducteurs

Abstract : This work is devoted to the study of the charged excitons (or trions) in semiconductor quantum wells, with or without an external magnetic field. The numerical results concern more particularly GaAS/GaAlAs and CdTe/CdZnTe compounds due to their possible in the field of optoelectronics. Charged excitons result from the binding of an exciton (electron hole pair) and an electron (negative trion) or a hole (positive trion), and may be considered as mobile as charged particles. Thus, they are expected to exhibit original properties, differentiating them from other excitonic complexes. In a first study, without any magnetic field, we have determined the binding energies of the two kinds of trions in the frame of the effective mass approximation within a two isotropic parabolic bands model. It results that in the case of the above compounds, the two kinds of trions are stable against dissociation for all values of the well widths. Moreover the optical absorption does not give rise to sharp lines, as in the cases of excitons or bound excitons, but to a main absorption threshold followed by a decreasing tail on its low energy side. We have also studied the influence of a magnetic field directed along the growth axis. It appears that the field gives rise to an increase of the energies. Moreover in the case of low magnetic fields, we have shown that the energies splits into Landau levels. This is due to the quantized motion of thein-plane motion of the center of mass of the trions. This result is original, and has not yet received experimental confirmation. Finally we have shown that the optical magnetoabsorption reduces to a serie of Dirac peaks
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Submitted on : Tuesday, April 24, 2018 - 3:32:24 PM
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  • HAL Id : tel-01775442, version 1



Aali Moradi. Action d'un champ magnétique sur les trions excitoniques dans les puits quantiques de semi-conducteurs. Physique [physics]. Université Paul Verlaine - Metz, 2001. Français. ⟨NNT : 2001METZ022S⟩. ⟨tel-01775442⟩



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