Why a magnetoactive quantum wire can act as an optical amplifier

The fundamental issues associated with the magnetoplasmon excitations are investigated in a

quantum wire characterized by a confining harmonic potential and subjected to a perpendicular

magnetic field. Essentially, we embark on the device aspects of the intersubband collective

(magnetoroton) excitation which observes a negative group velocity between the maxon and the

roton. The computation of the gain coefficient suggests an interesting and important application:

the electronic device based on such magnetoroton modes can act as an optical amplifier