Movement and amplification of exciton condensed phase pulses and interaction between pulses in semiconductor quantum wells

Formation and movement of an exciton pulse in an inhomogeneous potential are studied. It is shown that the pulse does not blur and the maximum of the exciton density in the pulse remains constant during the exciton lifetime if the pulse is formed from the condensed phase. The path, traversed by the excitons, can be increased by imposing an additional laser pulse on the system. Thereby, such a system can be used for information transmission over the exciton condensed phase.

► Exciton pulse does not blur during the exciton lifetime in the condensed state.
► Exciton pulse moves in an external field.
► Maximum of the density in the pulse remains constant during the exciton lifetime.
► Width of the pulse decreases in the condensed phase.
► Exciton pulse may be amplified by imposing additional laser pulse.