Theoretical study of recharging instability in quantum well infrared photodetectors

We study the response of the electron system in quantum well infrared photo detectors under illumination by infrared radiation to small electric-field and charge fluctuations using the proposed analytical model. It is shown th at uniform electric-field distributions corresponding to quasi-neutral quan tum wells can be unstable with regard to the excitation of the recharging w aves in a wide range of infrared radiation intensities.