Etude Des Structures À Cascade Quantique Sous Champ Magnétique
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Le travail de thèse a porté de façon générale sur l'étude des transitions électroniques dans les hétérostructures à cascade quantique. Deux types de structures ont été étudiés, le laser émettant dans la gamme des THz et le détecteur moyen infrarouge. Cette étude a été menée en champ magnétique appliqué perpendiculairement ou parallèlement aux couches des hétérostructures. Dans la première configuration, nous avons observé des oscillations de courant dans les deux types de structures. Ces oscillations sont la signature de différents processus de relaxation élastiques et inélastiques. Par la quantification de Landau, les temps de vie des électrons sur les niveaux mis en jeu dans les transitions sont modifiés menant à une modulation du courant en fonction du champ magnétique. Un modèle a été développé pour en comprendre l'origine. Enfin, dans la seconde configuration, en champ magnétique appliqué de façon parallèle aux couches des lasers à cascade, nous avons pu mettre en évidence un déplacement relatif des sousbandes de la transition radiative.
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