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La cause principale semble cependant ne pasêtrepasêtre une modification des diffusions intra-ou inter-bandes mais un effet de dopagé electronique Uné etude détaillée de l'´ evolution des gaps avec le dopage, notamment dans leséchantillonsleséchantillons présentant un dopage plus important, restèrestè a ? etre réalisée. Elle pourrait peutêtrepeutêtre mettre enévidenceenévidence un mélange des gaps tel que Mg ,
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