Microwave emission and acoustoelectric excitation in differently orientated nInSb

Xband microwave emission was observed from defined small areas of [110] and [100] crystallographically orientated nInSb rods in a static magnetic field and a low electric field at 77° K, with close relations to acoustoelectric current oscillations and/or saturation. For the acoustical explanation of the emission, off-axis gain and nonlinear effects in the acoustoelectric excitation seem to be important.