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Absorption and Emission of Acoustic Phonons by a Two‐Dimensional Electron Gas
Author(s) -
Erol M.
Publication year - 2001
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 - 10.1002/1521-3951(200106)225:2<369::aid-pssb369>3.0.co;2-#
Subject(s) - electron , absorption (acoustics) , phonon , atomic physics , acoustic emission , physics , materials science , acoustics , condensed matter physics , nuclear physics
We have observed acoustic phonons, absorbed as nanosecond heat pulses directly by the two‐dimensional electron gas (2DEG) of a GaAs–Al 0.3 Ga 0.7 As Modulation Doped Field Effect Transistor (MODFET) structure. The effect of phonons was to increase the electron temperature of the 2DEG and also the mobility. From a comparison with the effect of electrical heating, it was possible to determine the absolute level of the phonon power observed. Finally by comparison with data on TA and LA phonon absorption by the 2DEG, it could be concluded that the deformation potential was the dominant electron–phonon coupling mechanism in GaAs.