Strong plasmon-molecule coupling at the nanoscale revealed by first-principles modeling
Journal article, 2019

Strong light-matter interactions in both the single-emitter and collective strong coupling regimes attract significant attention due to emerging applications in quantum and nonlinear optics as well as opportunities for modifying material-related properties. Exploration of these phenomena is theoretically demanding, as polaritons exist at the intersection between quantum optics, solid state physics, and quantum chemistry. Fortunately, nanoscale polaritons can be realized in small plasmon-molecule systems, enabling treatment with ab initio methods. Here, we show that time-dependent density-functional theory calculations access the physics of nanoscale plasmon-molecule hybrids and predict vacuum Rabi splitting. By considering a system comprising a few-hundred-atom aluminum nanoparticle interacting with benzene molecules, we show that cavity quantum electrodynamics holds down to resonators of a few cubic nanometers in size, yielding a single-molecule coupling strength exceeding 200 meV due to a massive vacuum field of 4.5 V · nm−1. In a broader perspective, ab initio methods enable parameter-free in-depth studies of polaritonic systems for emerging applications.

molecular analysis

nanoparticle

benzene

excitons

parameter estimation

plasmons

Author

Tuomas Rossi

Chalmers, Physics, Materials and Surface Theory

Timur Shegai

Chalmers, Physics, Bionanophotonics

Paul Erhart

Chalmers, Physics, Materials and Surface Theory

Tomasz Antosiewicz

University of Warsaw

Chalmers, Physics, Bionanophotonics

Nature Communications

2041-1723 (ISSN)

Vol. 10 1 3336

Towards nanoscale reality in plasmonic hot-carrier generation

European Commission (Horizon 2020), 2019-04-01 -- 2021-03-31.

Subject Categories

Other Physics Topics

Theoretical Chemistry

Condensed Matter Physics

DOI

10.1038/s41467-019-11315-5

Related datasets

DOI: 10.5281/zenodo.3242317

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7/8/2020 1