Ferron-Polaritons in Superconductor/Ferroelectric/Superconductor Heterostructures

TL;DR

This paper predicts a new hybrid quasiparticle called ferron-polariton in superconductor/ferroelectric heterostructures, demonstrating ultrastrong coupling and potential for terahertz quantum technologies.

Contribution

It introduces the concept of ferron-polaritons and shows they can achieve ultrastrong coupling in superconductor-ferroelectric structures, a novel finding in light-matter interactions.

Findings

Ferron-polaritons predicted in heterostructures.

Ultrastrong coupling regime achieved.

Spectral gap in terahertz range.

Abstract

We predict the formation of ferron-polariton - a hybrid light-matter quasiparticle arising from the coupling between collective ferroelectric excitations (ferrons) and Swihart photons in a superconductor/ferroelectric/superconductor heterostructure. The coupling provides direct evidence for ferrons and reaches the ultrastrong-coupling regime, with a spectral gap in the terahertz range, orders of magnitude larger than those in magnetic analogues, reflecting the superior strength of electric dipole interactions. Our work establishes superconductor-ferroelectric heterostructures as a novel platform for exploring extreme light-matter coupling and for developing high-speed, ferroelectric-based quantum technologies at terahertz frequencies.