Broadband quasi-PT Symmetry Sustained by Inhomogeneous Broadening of the Spectral Line

D. M. Tsvetkov, V. A. Bushuev, V. V. Konotop +1

It is shown that inhomogeneous broadening of the spectral line of active impurities may sustain simultaneously parity (P) and time (T) symmetries of a medium, in a finite range of…