Amplitude-Dependent Ultrasonic Attenuation inn-InSb at Liquid-Helium Temperatures

Abstract

Ultrasonic attenuation which strongly depends on the amplitude of ultrasonic waves was observed in Ge-doped $n$-InSb at liquid-helium temperatures and in magnetic fields perpendicular to the propagation direction. The measurements were performed with 43- and 160-MHz shear waves propagating along the [110] direction and polarized in the [001] direction. This anomalous attenuation is explained mainly by the ultrasonic-wave-induced non-Ohmic behavior due to the repopulation of carriers between conduction and impurity bands.