Robustness of the Floquet-assisted superradiant phase and possible laser operation

TL;DR

This paper investigates the robustness of the Floquet-assisted superradiant phase in a driven dissipative Dicke model, demonstrating its potential for stable laser operation despite imperfections and dissipation.

Contribution

It provides a comprehensive analysis of the Floquet-assisted superradiant phase's robustness against linewidth, inhomogeneous broadening, and dissipation, highlighting its feasibility for laser applications.

Findings

Line narrowing occurs at the FSP transition, similar to laser line narrowing.

FSP remains stable against inhomogeneous broadening, with reduced light intensity.

FSP is robust against experimentally relevant dissipation levels.

Abstract

We demonstrate the robustness of the recently established Floquet-assisted superradiant phase of the parametrically driven dissipative Dicke model, inspired by light-induced dynamics in graphene. In particular, we show the robustness of this state against key imperfections and argue for the feasibility of utilizing it for laser operation. We consider the effect of a finite linewidth of the driving field, modelled via phase diffusion. We find that the linewidth of the light field in the cavity narrows drastically across the FSP transition, reminiscent of a line narrowing at the laser transition. We then demonstrate that the FSP is robust against inhomogeneous broadening, while displaying a reduction of light intensity. We show that the depleted population inversion of near-resonant Floquet states leads to hole burning in the inhomogeneously broadened Floquet spectra. Finally, we show that the FSP is robust against dissipation processes, with coefficients up to values that are experimentally available. We conclude that the FSP presents a robust mechanism that is capable of realistic laser operation.