ArticleNano letters2026
A Visible-Frequency Excitonic Reststrahlen Band in (PEA)2PbI4 Slabs.
Article in Nano letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Layered halide perovskites host exceptionally strong excitons, whose optical signatures are usually read as absorptive resonances on a smooth dielectric background. Strong excitons, however, can also reshape the dielectric response itself and drive the real permittivity negative, opening a reflective band─the visible, excitonic analogue of an infrared Reststrahlen band. Whether bare (PEA)2PbI4 slabs reach this regime has remained unclear. Here we show that low-temperature transmission of (PEA)2PbI4 slabs, driven by the intralayer-exciton manifold, evolves with increasing thickness from an excitonic dip into a broad near-zero-transmission interval with compressed Fabry-Pérot-like fringes. Transfer-matrix analysis with an effective Lorentz-oscillator dielectric response reproduces thickness-dependent evolution, reconstructs a finite negative-Re(ε) window, and implies near-ultrastrong exciton-photon coupling. Calculated field maps show suppressed in-plane field penetration within this interval and a driven longitudinal response near the high-energy (ε = 0) edge. These results identify (PEA)2PbI4 slabs as a cavity-free visible-frequency excitonic Reststrahlen material.
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