Dispersion equation for electromagnetic waves in a Dicke system

S. F. Lyagushyn; A. I. Sokolovsky

doi:10.15421/332204

S. F. Lyagushyn Oles Honchar Dnipro National University, Dnipro, Ukraine
A. I. Sokolovsky Oles Honchar Dnipro National University, Dnipro, Ukraine

Keywords: Dicke model, reduced description, polarization current, material equations, Lorentz broadening, dispersion law, complex frequency

Abstract

The self-organization process in a Dicke model is studied with taking into account electromagnetic field states. The interaction between two-level emitters provided by the field results in generating field waves of increasing amplitudes. The picture of superradiance development in a prolonged system can be described in terms of electromagnetic field in continuous medium formed by emitters. The generalized induction in the Dicke system is introduced on the basis of the material equation for charge current obtained using the Bogolyubov reduced description method. The dispersion equation for waves and its solutions are derived and analyzed. Non-singular expressions for material coefficients are proposed and used for calculating the wave characteristics.