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Anisotropy of Ultrasonic Amplification in n-InSb under Transverse Magnetic Field

Strong dependence of the amplification of shear waves of 1∼2 GHz on the azimuthal angle of the transverse magnetic field has been found in n-InSb at 77K. A simple model based on the assumption of the existence of highly conductive layers in n-InSb is proposed. This model explains qualitatively the observed anisotropy under low electric field.