Dynamics of the pulses of excitonic condensed phases in coupled quantum wells

We consider the dynamics of the pulses of excitonic con-densed phases in two interacting quantum wells, in which excitons are excited and in the presence of an external pulling force. We use the phenomenological expression of free energy for excitons and take into account the finiteness of the exciton life-time. It is assumed that the excitonic condensed phase arises due to the interaction between excitons, and the condensed phase parameters depend on the exciton lifetime. In a well having a long length, a periodic flow of pulses occurs, the speed of which depends on the pulling force. It is shown that the distance be-tween the pulses and other parameters can be controlled by irra-diation of another region of the quantum well, far from the obser-vation region. © 2020 Institute for Low Temperature Physics and Engineering. All rights reserved.