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Ebrahim I et al. i [3] investigate the temporal dynamics in strongly coupled ENZ plasmonic systems, illustrating the dynamics of field enhancement processes and highlighting the impact of dissipation loss. Beruete I et al. i [14] demonstrate experimentally the unusual waveguiding features of zero-permittivity structures with applications for enhanced sensing, and in parallel, Nicolussi I et al. i [15] discuss unusual unidirectional transparency in waveguides featuring zero-permittivity materials obeying parity-time symmetry. Zero-index metamaterials (photonic materials and artificial media with a near-zero refractive index in different parts of the electromagnetic spectrum) make possible novel forms of light-matter interactions where light behaves in a qualitatively different way than in conventional materials. [Extracted from the article]

In analogy to Lifshitz transitions in electronic systems, topological transitions have recently attracted widespread attention in photonic metamaterials, metasurfaces, and two-dimensional materials, enabling exotic regimes for light-matter interactions. Here, we discuss and study enhanced photonic local density of states in twisted hyperbolic bilayers, enabled by topological transitions emerging at specific twist angles. Our results enhance the understanding of nanoscale light-matter interactions in stacked optical materials as they are rotated with respect to each other in the context of twistronics and suggest emerging applications of these concepts for photonics, including for the manipulation of radiative heat transfer and the control and harvesting of light at the nanoscale. [ABSTRACT FROM AUTHOR]