Plasmon-driven exciton formation in a non-equilibrium Fermi liquid
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| author | Acharya, Rishi Gerber, Eli Bielinski, Nina Aguirre, Hannah E. Kim, Younsik Bernal-Choban, Camille Tenkila, Gaurav Sheikh, Suhas Mahaadev, Pranav Hoveyda-Marashi, Faren Roychowdhury, Subhajit Shekhar, Chandra Felser, Claudia Abbamonte, Peter Wieder, Benjamin J. Mahmood, Fahad |
| author_facet | Acharya, Rishi Gerber, Eli Bielinski, Nina Aguirre, Hannah E. Kim, Younsik Bernal-Choban, Camille Tenkila, Gaurav Sheikh, Suhas Mahaadev, Pranav Hoveyda-Marashi, Faren Roychowdhury, Subhajit Shekhar, Chandra Felser, Claudia Abbamonte, Peter Wieder, Benjamin J. Mahmood, Fahad |
| contents | Collective modes in Fermi liquids are usually regarded as dissipation channels that relax electronic excitations through Landau damping. Whether such modes can instead mediate the formation of correlated electronic states under non-equilibrium conditions remains an open question. Here we show that, under optical photo-doping, a bulk plasmon can drive correlated inter-band transfer within a transient electronic continuum. Using time- and angle-resolved photoemission spectroscopy (Tr-ARPES) on EuCd$_2$As$_2$ supported by electronic structure calculations, we observe that at high excitation density, plasmons transfer energy from a weakly dispersing bulk band into unoccupied surface states. This bulk-to-surface redistribution stabilizes a long-lived, energy-localized spectral feature consistent with a Mahan exciton. Our results uncover a non-equilibrium regime of Fermi-liquid physics in which collective modes do not merely dissipate energy, but also stabilize correlated bound states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_10108 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Plasmon-driven exciton formation in a non-equilibrium Fermi liquid Acharya, Rishi Gerber, Eli Bielinski, Nina Aguirre, Hannah E. Kim, Younsik Bernal-Choban, Camille Tenkila, Gaurav Sheikh, Suhas Mahaadev, Pranav Hoveyda-Marashi, Faren Roychowdhury, Subhajit Shekhar, Chandra Felser, Claudia Abbamonte, Peter Wieder, Benjamin J. Mahmood, Fahad Mesoscale and Nanoscale Physics Collective modes in Fermi liquids are usually regarded as dissipation channels that relax electronic excitations through Landau damping. Whether such modes can instead mediate the formation of correlated electronic states under non-equilibrium conditions remains an open question. Here we show that, under optical photo-doping, a bulk plasmon can drive correlated inter-band transfer within a transient electronic continuum. Using time- and angle-resolved photoemission spectroscopy (Tr-ARPES) on EuCd$_2$As$_2$ supported by electronic structure calculations, we observe that at high excitation density, plasmons transfer energy from a weakly dispersing bulk band into unoccupied surface states. This bulk-to-surface redistribution stabilizes a long-lived, energy-localized spectral feature consistent with a Mahan exciton. Our results uncover a non-equilibrium regime of Fermi-liquid physics in which collective modes do not merely dissipate energy, but also stabilize correlated bound states. |
| title | Plasmon-driven exciton formation in a non-equilibrium Fermi liquid |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2603.10108 |