Inducing exceptional points, enhancing plasmon quality and creating correlated plasmon states with modulated Floquet parametric driving
arxiv(2023)
Abstract
We propose a method to parametrically excite low frequency collective modes
in an interacting many body system using a Floquet driving at optical
frequencies with a modulated amplitude. We demonstrate that it can be used to
design plasmonic time-varying media with singular dispersions. Plasmons near
resonance with half the modulation frequency exhibit two lines of exceptional
points connected by dispersionless states. Above a critical driving strength,
resonant plasmon modes become unstable and undergo a continuous transition
towards a crystal-like structure stabilized by interactions and nonlinearities.
This new state breaks the discrete time translational symmetry of the drive as
well as the translational and rotational spatial symmetries of the system and
exhibits soft, Goldstone-like phononic excitations. Below the instability
threshold, our method can be used to enhance the quality of plasmon resonances.
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