Two Different Modes of Acoustoelectric Oscillation and Microwave Emission from n-InSb

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Abstract
Two modes of microwave emission from a bar of n -InSb of [110] orientation were observed at 77°K in crossed electric and magnetic fields and were found to trace the threshold curve for the two modes of acoustoelectric current oscillation. These two modes of the microwave emission are closely related to the two modes of the acoustoelectric oscillation. The first mode was observed at a magnetic field less than 2 kG and its minimum threshold electric field for the microwave emission was about 20 V/cm at 400 G. The second mode was observed at fields higher than 2 kG and its minimum threshold electric field for the microwave emission was about 5.5 V/cm at 5 kG. For the first mode the frequency spectrum of the microwave emission was distributed mainly between 3 GHz and 5 GHz, and for the second mode between 20 MHz and 300 MHz. The angular dependence of the transverse magnetic field was different for these two modes. It is shown from these results and the difference between the I-V characteristics that the two modes of the acoustoelectric oscillation and accompanied microwave emission are classified to two regimes, q l 1.

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