Oscillating electric field domains in GaAsAlAs superlattices

Abstract We report on the observation of self-sustained oscillations associated with electric-field domains in GaAs AlAs superlattices. The samples are n -doped superlattices embedded between n + -contacts. The observed oscillation frequencies between 700 kHz and 100 MHz depend strongly on the coupling strength between adjacent wells. Monitoring the oscillations with time-resolved photoluminescence spectroscopy indicates that the current oscillations are due to the movement of a charge accumulation layer at the domain boundary.