The effect of He–Ne illumination on giant optical fluctuations in double quantum wells under QHE conditions

The effect of He–Ne illumination on giant optical fluctuations in the system of double GaAs/AlGaAs quantum wells under quantum Hall effect conditions was found. Typical behavior was revealed for such objects in total filling factor νtot=4 in dependence on He–Ne pumping power. As initial stage the giant fluctuation intensity increased dramatically and then it steadily decreased. The increasing of giant fluctuation intensity at small power of the illumination is resulted presumably from the minimizing of a random potential effect on the Landau level shape. Subsequent decreasing of the noise level is connected with the decreasing of quasi-equilibrium electron concentration in two-dimensional system when He–Ne illumination power increasing.