Charge trapping in the system of interacting quantum dots

• Charge relaxation in the interacting QDs due to Coulomb interaction was theoretically analyzed.
• Strong charge trapping effects in the proposed system were revealed.
• Interacting dots were demonstrated to be effective high quality charge traps.
• We suggested the model to be applicable for observations of the charge trapping effects.

We analyzed the localized charge dynamics in the system of N interacting single-level quantum dots (QDs) coupled to the continuous spectrum states in the presence of Coulomb interaction between electrons within the dots. Different dots geometry and initial charge configurations were considered. The analysis was performed by means of Heisenberg equations for localized electron pair correlators.We revealed that charge trapping takes place for a wide range of system parameters and we suggested the QDs geometry for experimental observations of this phenomenon. We demonstrated significant suppression of Coulomb correlations with the increasing QDs number. We found the appearance of several time scales with the strongly different relaxation rates for a wide range of the Coulomb interaction values.