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The Nonlinear Effects in 2DEG Conductivity Investigation by an Acoustic Method
Author(s) -
Drichko I. L.,
Diakonov A. M.,
Kagan V. D.,
Kreshchuk A. M.,
Polyanskaya T. A.,
Savelev I. G.,
Smirnov I. Yu.,
Suslov A. V.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199801)205:1<357::aid-pssb357>3.0.co;2-k
Subject(s) - surface acoustic wave , condensed matter physics , acoustic wave , relaxation (psychology) , piezoelectricity , fermi gas , heterojunction , electron , absorption (acoustics) , delocalized electron , materials science , scattering , conductivity , physics , acoustics , optics , psychology , social psychology , quantum mechanics
The parameters of a two‐dimensional electron gas (2DEG) in a GaAs/AlGaAs heterostructure were determined by an acoustic (contactless) method in the delocalized electron region ( B ≤ 2.5 T). Nonlinear effects in Surface Acoustic Wave (SAW) absorption by 2DEG are determined by electron heating in the electric field of SAW, which may be described in terms of the electron temperature T e . The energy relaxation time τ ε is determined by the scattering at piezoelectric potential of acoustic phonons with strong screening. At different SAW frequencies the heating depends on the relationship between ωτ ε and 1 and is determined either by the instantaneously changing wave field (ωτ ε < 1), or by the average wave power (ωτ ε > 1).