.. Progrès-des-techniques-de-croissance, 77 3.2.1 L'attaque chimique du substrat après gravure

.. Nature-desétatsdesétats-selon-le-type-de-désordre, 82 3.3.1 Compétition avec l'interaction, p.83

. Son-intensité-est-relativement-faible, en raison de la faible absorption sur l'´ etat excité par rapportàrapport`rapportà celle des transitions du fil Cette expérience prouve donc que les pics A' et A'2 observés en excitation non résonante sont associésassociésà une seule et même bo??tebo??te quantique, et nous permet d'exclure l'hypothèse selon laquelle le pic A'2 serait dûdûà la recombinaison radiative d'un exciton piégé dans une bo??tebo??te voisine de la zone excitée

. Le-biexciton, ci-après, est l'´ etat lié de deux excitons couplés par l'interaction Coulombienne De la mêmemanì ere que l'exciton est l'analogue de l'hydrogène en physique atomique, le biexciton est l'analogue de la molécule de dihydrogène

. Celle-du-biexciton, Elle peut doncêtredoncêtre mesurée dans le spectre de luminescence comme la différence d'´ energie entre les deux pics A, d'´ energie E X et A2

. Lors-de-la-recombinaison-radiative-du-biexciton, ´ etat final celui d'un exciton seul et un photon. L'´ energie de liaison du biexciton est de 1,6 meV pour le pic A2 et de 2,6 meV pour le pic A'2. Ces valeurs sont relativement représentatives desénergiesdesénergies de liaison de biexcitons observées sur cetéchantilloncetéchantillon M304, ainsi que sur d'autreséchantillonsautreséchantillons en régime 0D tels que le M288

?. Le-régime-de-densités, intermédiaire " , telles que 0,1 < n a 1D X < 1 (soit 1, sera aussí etudié sous excitation continue

?. Enfin, des expériences réalisées sous excitation impulsionnelle nous permettront d'atteindre le régime que nous qualifierons de " dense

. Le-régime-dilué-dans-les??lotsles?les??lots, Dans les fils quantiques en régime 1D, l'´ evolution du spectre de luminescence en fonction de la puissance d'excitation, i.e. de la densité de porteurs, dépend du type d'? ?lot considéré. Nous allons dans un premier temps présenter les résultats obtenus dans des??lotsdes?des??lots dits " typiques

. Le-biexciton-lorsque-la-puissance, cm ?2 qui correspondàcorrespondà la présence d'un exciton en moyenne dans la zone excitée (cf Sec. 5.2.1), deux raies A2 et B2 apparaissent respectivement1,5 et 2,2 meV en-dessous des raies A et B, qui ne sont pas associéesassociéesà des??lotsdes?des??lots voisins et croissent demanì ere sur-linéaire avec la puissance d'excitation. Elles sont attribuées aux recombinaisons de biexciton de chacun des deux??lotsdeux?deux??lots. Il peut para??trepara??tre surprenant que lesénergieslesénergies de liaison des deux biexcitons soient différentes, alors que ces??lotsces?ces??lots sont de longueur très supérieurè a l'extension du biexciton, qui est libre a priori

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