Period of photoconductivity oscillations and charge dynamics of quantum dots in $p-i-n$ GaAs/InAs/AlAs heterojunctions

Quantum oscillations of photoconductivity in $p-i-n$ GaAs/InAs/AlAs quantum-dot heterojunctions have been studied. The dominating effect of the dynamics of charge accumulation of optically excited holes at quantum dots on the oscillation period and on the general evolution of the holes with a change in the illumination power has been shown within a simple electrostatic model. Investigation of the temperature dependence of the oscillating structure of the current-voltage characteristics has confirmed our interpretation.