Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-10-07
Semiconductors 33, 892- (1999)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Revtex 5 pages + 5 EPS Figures, v.2 - minor corrections in text and pics
Scientific paper
10.1134/1.1187626
The absorption and variation of the velocity of a surface acoustic wave of frequency $f$= 30 MHz interacting with two-dimensional electrons are investigated in GaAs/AlGaAs heterostructures with an electron density $n=(1.3 - 2.8) \times 10^{11} cm^{-2}$ at $T$=1.5 - 4.2 K in magnetic fields up to 7 T. Characteristic features associated with spin splitting of the Landau level are observed. The effective g factor and the width of the spin-split Landau bands are determined: $g^* \simeq 5$ and $A$=0.6 meV. The greater width of the orbital-split Landau bands (2 meV) relative to the spin-split bands is attributed to different shielding of the random fluctuation potential of charged impurities by 2D electrons. The mechanisms of the nonlinearities manifested in the dependence of the absorption and the velocity increment of the SAW on the SAW power in the presence of spin splitting of the Landau levels are investigated.
Diakonov Andrey M.
Drichko Irina L.
Preobrazenskiy V. V.
Smirnov Ivan Yu.
Toropov Aleksandr I.
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