Current oscillations and microwave emission in indium antimonide

The oscillatory properties of indium antimonide subjected to comparatively high applied parallel electric and magnetic fields at 77°K have been studied. In particular, the low-frequency oscillations in the current have been characterized by an empirical equivalent circuit. This circuit has been used to help clarify the relationship between these current oscillations and the microwave emission which is also observed under the same experimental conditions. This work suggests that there are at least two separate mechanisms of microwave emission, one that is associated with and requires low-frequency oscillations in the sample current, and one which is not associated with and is independent of low-frequency oscillations in the sample current.