TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.14.2.018
TI  - Floquet engineering of non-equilibrium superradiance
PY  - 2023/02/13
UR  - https://www.scipost.org/SciPostPhys.14.2.018
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 14
IS  - 2
SP  - 018
A1  - Broers, Lukas
AU  - Mathey, Ludwig
AB  - We demonstrate the emergence of a non-equilibrium superradiant phase in the dissipative Rabi-Dicke model. This phase is characterized by a photonic steady state that oscillates with a frequency close to the cavity frequency, in contrast to the constant photonic steady state of the equilibrium superradiant phase in the Dicke model. We relate this superradiant phase to the population inversion of Floquet states by introducing a Schwinger representation of the driven two-level systems in the cavity. This inversion is depleted near Floquet energies that are resonant with the cavity frequency to sustain a coherent light-field. In particular, our model applies to solids within a two-band approximation, in which the electrons act as Schwinger fermions. We propose to use this Floquet-assisted superradiant phase to obtain controllable optical gain for a laser-like operation.
ER  -

@Article{10.21468/SciPostPhys.14.2.018,
	title={{Floquet engineering of non-equilibrium superradiance}},
	author={Lukas Broers and Ludwig Mathey},
	journal={SciPost Phys.},
	volume={14},
	pages={018},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.14.2.018},
	url={https://scipost.org/10.21468/SciPostPhys.14.2.018},
}