ACOUSTOELECTRIC AMPLIFICATION IN INSB

In study of two modes of acoustoelectric domain oscillation which occur in InSb in transverse magnetic field, lithium niobate transducers on acoustic amplifier were used to measure linear acoustic gain as function of electric and magnetic field and frequency; at low magnetic fields, wavelength of sound waves is less than mean free path of electrons, and macroscopic theories break down; extending microscopic theory of magnetacoustic interactions to include electron drift gives excellent agreement between theory and experiment and results account for two modes of acoustic domain formation.