Quantum surface effects in strong coupling dynamics

Abstract

Plasmons in nanostructured metals are widely utilized to trigger strong light--matter interactions with quantum light sources. While the nonclassical behavior of such quantum emitters (QEs) is well-understood in this context, the role of quantum and surface effects in the plasmonic resonator is usually neglected. Here, we combine the Green's tensor approach with the Feibelman $d$-parameter formalism to theoretically explore the influence of quantum surface effects in metal-dielectric layered nanostructures on the relaxation dynamics of a proximal two-level QE. Having identified electron spill-out as the dominant source of quantum effects in jellium-like metals, we focus our study on sodium. Our results reveal a clear splitting in the emission spectrum, indicative of having reached the strong-coupling regime, and, more importantly, non-Markovian relaxation dynamics of the emitter. Our findings establish that strong light--matter coupling is not suppressed by the emergence of nonclassical surface effects in the optical response of the metal.

6 pages, 5 figures

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Cited by in corpus (7)

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• Nonlocal effects in atom-plasmon interactions
• Quasinormal mode theory for nanoscale electromagnetism with quantum surface responses
• Quantum-informed plasmonics for strong coupling: the role of electron spill-out
• Strong coupling of quantum emitters and the exciton polariton in MoS${}_2$ nanodisks
• Optical scattering imaging with sub-nanometer precision based on position-ultra-sensitive giant Lamb shift