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- W4322493140 abstract "Organic polaritons resulting from the strong hybridisation between photons and matter excitations have arisen as a suitable platform to device light-matter technological interfaces at room temperature. Despite their inherent complexity, organic polaritons are commonly regarded as coherent light-matter excitations that can be described in terms of Landau's quasiparticle approach. Here, we experimentally unveil the role of incoherent matter excitations on the polaritons by exploring the relevant energy-momentum parameter space. We demonstrate the emergence of a well-defined lower polariton branch and an intriguing fading of the upper polariton at its entrance to a continuum of matter excitations. This marks the breakdown of the simplistic quasiparticle picture for this branch and the formation of a more complex quantum state. Our experimental results are sustained by a general theoretical framework that allows understanding the light-matter hybridisation beyond the quasiparticle approach. Our work expands the understanding of organic polaritons in all their complexity and increases their technological significance." @default.
- W4322493140 created "2023-02-28" @default.
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- W4322493140 date "2023-02-27" @default.
- W4322493140 modified "2023-10-17" @default.
- W4322493140 title "Fate of the upper polariton: Breakdown of the quasiparticle picture in the continuum" @default.
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- W4322493140 doi "https://doi.org/10.1103/physrevb.107.l081302" @default.
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