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Electron beam driven collective self hybridized exciton polaritons — arXiv:2609.07164

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.07164
License (as archived): CC0-1.0
Archived: 2026-10-16T15:44:12.462Z
SHA-256 of the archived text: 2de7bd580fe9a22ac2f422ff6ea932792889cab7743e0512bba05c3e2dc9d2e3
Stable URL of this page: https://metraipolis.com/documento/dc_ebbc018646a2

How to cite

Electron beam driven collective self hybridized exciton polaritons — arXiv:2609.07164 — arXiv (en), https://arxiv.org/abs/2609.07164 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_ebbc018646a2 (Metraipolis archive dc_ebbc018646a2, sha256 2de7bd580fe9a22ac2f422ff6ea932792889cab7743e0512bba05c3e2dc9d2e3)

BibTeX

@misc{dcebbc018646a2,
  title = {Electron beam driven collective self hybridized exciton polaritons — arXiv:2609.07164},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.07164},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_ebbc018646a2; sha256 2de7bd580fe9a22ac2f422ff6ea932792889cab7743e0512bba05c3e2dc9d2e3},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.07164. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Self-hybridized exciton polaritons in layered semiconductors emerge from the hybridization of excitonic resonances with confined photonic modes in films and provide a versatile platform for controlling light--matter interactions at the nanoscale. Yet, the nature of exciton--photon interactions and the collective and synchronous strong coupling of multiple excitons to the same photonic mode remain largely unexplored. Here, we use complementary momentum-resolved photoluminescence and cathodoluminescence spectroscopy to compare self-hybridized exciton polaritons in Ruddlesden--Popper perovskite flakes under optical and electron-beam excitation. We find that cathodoluminescence exhibits remarkably larger polaritonic level repulsion than photoluminescence, revealing an enhanced effective coupling strength under electron-beam excitation. We attribute this enhancement to the collective coherent excitation of multiple excitons by fast electrons, which couple to the same photonic mode and increase the interaction strength according to a $g_N=g_1\sqrt{N}$ scaling, with an effective number of up to $N\approx23$ coherently coupled excitonic oscillators. By reducing the electron kinetic energy, we further uncover a crossover to a partially incoherent excitation regime in which higher-order Fabry--Pérot exciton-polariton resonances disappear, leaving only the lowest polariton branches while coherent transition radiation persists. This transition arises because low-energy electrons excite excitons over extended spatial volumes, washing out the phase coherence required to sustain collective coupling and form polaritonic resonances. Our work shows that electron beams can actively modify collective light--matter coupling in layered semiconductors and establishes cathodoluminescence as a route to access excitation regimes beyond all-optical excitation schemes.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-09 in quant-ph).
Categorie arXiv: Quantum Physics (quant-ph) ; Materials Science (cond-mat.mtrl-sci).
Pagina del lavoro: https://arxiv.org/abs/2609.07164 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-16T15:32:34.775Z dalla pagina https://arxiv.org/catchup/quant-ph/2026-09-09?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).