Quantum control of charge carriers in quantum wells

Abstract

We present theoretical studies of the quantum control of charge carriers in a direct‐current‐biased (DC‐biased) asymmetric double quantum well (ADQW). The objective in this work is to find the laser pulse that drives an electronic wave packet to maximum overlap with a target distribution in a chosen well at a chosen time. We use a genetic algorithm to determine the optimal parameters of the excitation pulses. The robustness of the control is analyzed with respect to the magnitude of the DC field, and two types of defects in the ADQW potential profile, a point defect and a notch. In all cases studied, the genetic algorithm is able to reoptimize the laser field to achieve the desired objective. Finally, we consider the effects of coupling the ADQW to a harmonic bath. We find that a coupling large enough to distort the effective potential significantly does not eliminate the control. Our results indicate that control in the ADQW is quite robust, which should make it a favorable system for further experimental study. © 2000 John Wiley & Sons, Inc. Int J Quant Chem 77: 393–402, 2000

Adiabatic passage in quantum wells

“…The basic theoretical approach used in this work has been described previously [25,26]. The method captures the major contributions of the electronic dynamics in a QW structure.…”