Terahertz Light Trapped: New States Emerge in Superconductor Heterostructures
![The study of a superconducting/ferroelectric/superconducting structure reveals distinct ferron-polariton and ferron excitations, characterized by parameters [latex]\alpha_{1,2,3} = \{-2.012, 3.608, 1.345\} \times 10^{9} \text{ Nm/C}^{2}[/latex] and [latex]\Omega_{p} = 6.39 \text{ THz}[/latex], demonstrating that the [latex]\delta p_{x}[/latex]-ferron-polariton branches ([latex]\omega_{u,l}[/latex], shown in blue) diverge from the [latex]\delta p_{x}[/latex]-ferron dispersion ([latex]\omega_{1}[/latex], shown in red) as effective wavelength approaches infinity, while the [latex]\delta p_{y,z}[/latex]-ferron frequencies ([latex]\omega_{\pm}[/latex], shown in blue-red dashed curves) remain consistent both with superconducting screening and in the limit of infinite effective wavelength.](https://arxiv.org/html/2602.05473v1/dispersion.png)
Researchers have demonstrated the creation of novel light-matter quasiparticles in layered superconductor/ferroelectric materials, paving the way for exploring quantum phenomena at terahertz frequencies.








