Coherent multidimensional spectroscopy with nanoscale spatial resolution was used to directly probe a plasmon polariton quantum wave packet. To reproduce these results an improved quantum model of photoemission was required, in which the coherent coupling between plasmons and electrons is accounted for with the plasmon excitations extending beyond a two-level model.
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This is a summary of: Pres, S. et al. Detection of a plasmon-polariton quantum wave packet. Nat. Phys. https://doi.org/10.1038/s41567-022-01912-5 (2023).
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Identifying the quantum fingerprint of plasmon polaritons. Nat. Phys. 19, 622–623 (2023). https://doi.org/10.1038/s41567-022-01925-0
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DOI: https://doi.org/10.1038/s41567-022-01925-0
