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Propriétés électroniques et optiques des trions excitoniques dans les semi-conducteurs bidimensionnels: étude de l'action d'un champ magnétique uniforme

Abstract : This thesis is devoted to the study of excitonic trions in bidimensional semiconductors (S.C.). These quasi-particles can be the result, assuming some conditions, of the binding of an exciton and an electron or a hole in semiconductors. They differ from others excitonic "complexes" by their charge and mobility winch allow some original properties, especially in quasi-bidimensional semiconductors (S.C. superlattices, quantum wells). The study of excitonic trions is of great interest for theory as well as for experiment. It allows the understanding of "radiative" recombination mechanisms winch control some devices in optoelectonic or telecommunication. This study also provides to fundamental physics new models for systems containing few particles. This work allows to point out that, in the absence of magnetic field, these quasi-particles are much more stable in bidimensional S.C. that in 3D S.C.. Therefore, their observation should be easier in 2D media. Moreover room temperature studies may become possible for such quasi-particles. We have shown that the absorption line shape differs from that of excitons or other localized excitonic complexes. Their identification is therefore easier. We have shown that the influence of a magnetic field on trions leads to an increasing and additional quantifization of the S.C. surface on the quantifization degree. This quantifization is total with a magnetic field perpendicular to plane and minimal with the field parallel to plane. For a weak enough magnetic field, the trions behave as free and charged quasi-particles. In this case, the magnetic field gives rises to landau levels as in 3D S.C.. With a perpendicular magnetic field, the magnetoabsorption reduces to Dirac peaks. However, with a parallel field, there appears a series of lines decreasing in the low energy region below a main absorption edge. Our results are original and specific to excitonic trions. They can help in proving the occurence and the identification of these quasi-particles in quasi-bidimensional media (super lattices S.C. and quantum wells)
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Abdelmajid Aïnane. Propriétés électroniques et optiques des trions excitoniques dans les semi-conducteurs bidimensionnels: étude de l'action d'un champ magnétique uniforme. Matière Condensée [cond-mat]. Université Paul Verlaine - Metz, 1991. Français. ⟨NNT : 1991METZ005S⟩. ⟨tel-01775928⟩



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