Characterization of a two-dimensional electron gas in GaAs–AlGaAs by surface acoustic waves
Keyword(s):
We report simultaneous magnetotransport and surface acoustic-wave attenuation measurements performed at 1.25 K on a two-dimensional electron gas (2-DEG) GaAs–AlGaAs 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 carrier 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.
2002 ◽
Vol 17
(10)
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pp. 1111-1114
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1996 ◽
Vol 8
(36)
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pp. 6597-6605
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1996 ◽
Vol 54
(19)
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pp. 13878-13884
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