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- Title
Acoustoelectric Attenuation and Phase Transition Due to Carriers in Semiconductor.
- Authors
Kumar, Praveen; Kri., Amita; Alok, Ujjwal
- Abstract
The response of the charge carriers of a semiconductor to a traveling acoustic wave leads to transfer of energy between the wave and the electrons, such a wave drags free carriers and as a result attenuation and phase transition appears across the sample, near a phase transition there are large fluctuation, in the case of a softening phonon mode, the fluctuations correspond simply to vibrational modes that are excited thermally when the energy of the phonons has been shifted down near to zero. The effects of interaction with thermal phonons, which produce temperature dependent attenuation and free carriers which may give attenuation or amplification, and electrons bound to shallow donors, giving rise to attenuation at low temperatures. There are obtained a complex form for the change in distribution function arising due to the passage of acoustic wave through a semiconductor. The imaginary part of this function has been used for ascertaining the phase transition between the self-consistent field and the acoustoelectric current and the real part has been utilized for computing the attenuation constant for n -- Indium antimonide.
- Subjects
ELECTROACOUSTIC transducers; PHASE transitions; SEMICONDUCTORS; INDIUM antimonide crystals; ENERGY transfer; WAVES (Physics); ELECTRONS
- Publication
International Transactions in Applied Sciences, 2011, Vol 3, Issue 4, p835
- ISSN
0974-7273
- Publication type
Article