Amplification and passing through the barrier of the exciton condensed phase pulse in double quantum wells

TL;DR

This study investigates how exciton condensed phase pulses move, pass through barriers, and can be amplified in double quantum wells, revealing potential control mechanisms for exciton-based devices.

Contribution

It introduces a phenomenological model for exciton condensed phase pulses, analyzing their movement, barrier interaction, and amplification in double quantum wells.

Findings

Exciton condensed phase pulses move steadily along the slot with constant maximum density.

Pulses can penetrate and be stopped by barriers, depending on conditions.

Additional laser pulses can amplify and recover exciton pulses after damping.

Abstract

The peculiarities and the possibility of a control of exciton condensed pulse movement in semiconductor double quantum well under the slot in the metal electrode are studied. The condensed phase is considered phenomenologically with the free energy in Landau-Ginzburg form taking into account the finite value of the exciton lifetime. It was shown that the exciton condensed phase pulse in the presence of an external linear potential moves along the slot direction with a constant value of a maximum density during exciton lifetime, while the exciton gas phase pulse is blurred. The penetration of the exciton condensed phase pulse through the barrier and its stopping by the barrier are studied. Also, it was shown that the exciton pulse in the condensedphase can be amplified and recovered after damping by imposing an additional laser pulse. Solutions for the system of excitons in double quantum well under the slot in the electrode under steady-state irradiation in the form of bright and dark autosolitons were found.