We report simultaneous magnetotransport and surface acoustic-wave attenuation measurements performed at 1.25 K on a two-dimensional electron gas (2-DEG) GaAs-A1GaAs heterojunction sample. The carrier density was varied by means of the persistent photoconductivity effect. A comparison of the conductivity deduced from the two types of measurements is used to obtain information about the homogeneity of the 2-DEG sample. For this specific sample a simple model shows that there exists a 20% variation in the canier density at some intermediate carrier densities, while prior to illumination and after saturation with light the spread in carrier density in the sample was only a few percent.Nous presentons des mesures simultanees de magnetotransport et d'attknuation d'ondes acoustiques de surface effectuees a 1,25 K sur un Cchantillon d'hCtCrojunction 2-DEG (two-dimensional electron gas) GaAs-AIGaAs. Le densit6 des porteurs Ctait variee au moyen de I'effet de phtoconductivitC persistante. Une comparaison entre les valeurs de la conductivite deduites des deux types de mesures est utilisCe pour obtenir de I'information sur I'homogentite de I'echantillon. Dans le cas de cet Cchantillon particulier, un modele simple montre qu'il existe une variation de 20% dans la densite de,porteurs pour certaines densites intermediaires, alors qu'avant I'illumination et apres saturation lumineuse, les Ccarts entre les valeurs de la densite de porteurs dans I'Cchantillon n'itaient que quelques pour-cent.[Traduit par la redaction]Can.
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