  The objective of this work is to numerically integrate in space and time the
effective-mass Schrodinger equation for an excitonic wave packet in a coupled
quantum-well system under a time-dependent electric field. Taking as a starting
point a time-dependent Hartree potential, we derive the nonlinear dynamical
evolution of the excitonic wave function. We found that the system resonant
condition can be modified owing to the reaction field generated by a charge
dynamically trapped in the quantum-well pair. As a result, this study raises a
broader question: is it possible to create an electrostatic trap for indirect
excitons at high ac frequencies? We conclude there is a possibility of having
another kind of terahertz electromagnetic radiation emerging from an excitonic
trap.
