Abstract
The absorption coefficient for surface acoustic wave Γ and variation in the wave velocity ΔV/V were measured in GaAs/AlGaAs heterostructures; the above quantities are related to interaction of the wave with two-dimensional electron gas and depend nonlinearly on the power of the wave. Measurements were performed under conditions of the integer quantum Hall effect (IQHE), in which case the two-dimensional electron gas was localized in a random fluctuation potential of impurities. The dependences of the components σ1(E) and σ2(E) of high-frequency conductivity σ=σ 1−iσ 2 on the electric field of the surface wave were determined. In the range of the conductivity obeying the Arrhenius law
, the results obtained are interpreted in terms of the Shklovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) theory of nonlinear percolation-based conductivity, which makes it possible to estimate the magnitude of the fluctuation potential of impurities. The dependences σ1(E) and σ2(E) in the range of high-frequency hopping electrical conductivity, in which case
and the theory of nonlinearities has not been yet developed, are reported.
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Translated from Fizika i Tekhnika Poluprovodnikov, Vol. 34, No. 4, 2000, pp. 436–442.
Original Russian Text Copyright © 2000 by Drichko, D’yakonov, Smirnov, Toropov.
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Drichko, I.L., D’yakonov, A.M., Smirnov, I.Y. et al. Nonlinearity of acoustic effects and high-frequency electrical conductivity in GaAs/AlGaAs heterostructures under conditions of the integer quantum Hall effect. Semiconductors 34, 422–428 (2000). https://doi.org/10.1134/1.1188000
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DOI: https://doi.org/10.1134/1.1188000