Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1997-10-10
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
RevTeX, 6 pages, 4 PS-figures, submitted to Phys.St.Sol.(Replaced with PS-figures technical corrections)
Scientific paper
High-frequency (HF) conductivity ($\sigma_{hf}$) measured by an acoustical method has been studied in GaAs/AlGaAs heterostructures in a linear and nonlinear regime on acoustic power. It has been shown that in the quantum Hall regime at magnetic fields corresponding to the middle of the Hall plateaus the HF conductivity is determined by the sum of the conductivity of 2-dimensional electrons in the high-mobility channel and the hopping conductivity of the electrons in the doped thick AlGaAs layer. The dependence of these conductivities on a temperature is analyzed. The width of the Landau level broadened by the impurity random potential is determined.
Diakonov Andrey M.
Drichko Irina L.
Smirnov Ivan Yu.
Suslov A. V.
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