Second-order coherence properties of ultrafast polariton dynamics in plasmonic lattices
Abstract
The first-order coherence properties of strongly coupled systems supporting polariton lasing and Bose-Einstein condensation (BEC) have been thoroughly studied and show consistent results. In contrast, second-order coherence properties have been found to vary for different systems, and the second-order coherence function can deviate from the value of one, typical for atomic BEC, revealing super-Poissonian fluctuations even above the BEC/polariton lasing threshold. This calls for a deeper understanding of the emission statistics and dynamics in light-based condensates, especially in the non-equilibrium regime. Here we demonstrate a coherent state of polariton emission from a plasmonic lattice measured as the second-order coherence function value separately for Γ- and non-Γ-point radiation (ground state and high-energy tail). We observe a high degree of coherence with the value g(2)(τ=0)−1<10−4. We also demonstrate the ultrafast (>1 THz) nature of the dynamics. The process can be interpreted as a BEC with ultrafast, sub-50-fs thermalization, but we also suggest an alternative explanation as superradiance in a system where the emitters have vibrational degrees of freedom.
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BibTeX
@misc{mamonov2026secondorder,
title = {{Second-order coherence properties of ultrafast polariton dynamics in plasmonic lattices}},
author = {Evgeny A. Mamonov and Lukas Freter and Sioneh Eyvazi and Elliot W. Lloyd and Päivi Törmä},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.37142},
eprint = {2609.37142},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.37142},
}
RIS
TY - UNPB
TI - Second-order coherence properties of ultrafast polariton dynamics in plasmonic lattices
AU - Evgeny A. Mamonov
AU - Lukas Freter
AU - Sioneh Eyvazi
AU - Elliot W. Lloyd
AU - Päivi Törmä
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.37142
UR - https://arxiv.org/abs/2609.37142
AB - The first-order coherence properties of strongly coupled systems supporting polariton lasing and Bose-Einstein condensation (BEC) have been thoroughly studied and show consistent results. In contrast, second-order coherence properties have been found to vary for different systems, and the second-order coherence function can deviate from the value of one, typical for atomic BEC, revealing super-Poissonian fluctuations even above the BEC/polariton lasing threshold. This calls for a deeper understanding of the emission statistics and dynamics in light-based condensates, especially in the non-equilibrium regime. Here we demonstrate a coherent state of polariton emission from a plasmonic lattice measured as the second-order coherence function value separately for Γ- and non-Γ-point radiation (ground state and high-energy tail). We observe a high degree of coherence with the value g^(2)(τ=0)−1<10^−4. We also demonstrate the ultrafast (>1 THz) nature of the dynamics. The process can be interpreted as a BEC with ultrafast, sub-50-fs thermalization, but we also suggest an alternative explanation as superradiance in a system where the emitters have vibrational degrees of freedom.
ER -