Acoustomagnetoelectric and Acoustoelectric Effects In n-InSb at Low Temperatures

Abstract

Acoustomagnetoelectric (AME) and acoustoelectric (AE) effects were investigated in n-InSb on applying longitudinal acoustic waves of 8.7 GHz at liquid helium temperatures in magnetic fields up to 12 KOe. The temperature dependences and the magnetic field dependences of the AME and the AE effects were measured. The AME effect in the weak magnetic field region was compared with Épshtein and Gulyaev’s theory. In high magnetic field region above 3 KOe, the quantum limit condition is valid, and so the theory of the AME effect in the quantum limit condition was newly developed. The broadening of the lowest Landau level could be estimated by comparing the experimental results with the theory. The broadening is about 0.17 meV at 4 KOe at 4.2°K and it decreased with increasing the magnetic field. Thus the long range impurity scattering process could be expected in the high magnetic field region.