Active control of excitonic strong coupling and electroluminescence in electrically driven plasmonic nanocavities
Abstract
Enhancement and active control of light-matter interactions at the atomic scale is important for developing next-generation nanophotonic and quantum optical devices. Here, we demonstrate electric control of both excitonic strong coupling and electroluminescence by integrating semiconductor monolayers into a nanometer gap of electrically driven nanocube-on-mirror plasmonic nanocavities. Particularly, in a strongly-coupled system of nanocavity plasmons and WSe2 excitons, the ultra-strong electric field generated in the nanocavity gap enables a reversible modulation of the Rabi splitting between ~102 and 80 meV with a bias below 2.5 V. In the quantum tunnelling regime, by injecting carriers into a nanocavity-integrated WS2 monolayer, bias-controlled spectrally tunable electroluminescence from charged or neutral excitons is achieved with an external quantum efficiency reaching ~3.5%. These results underline practical approaches to electric control of atomic-scale light-matter interactions for applications including nanoscale light sources, ultrafast electro-optic modulation, quantum information processing and sensing.
Keywords
Cite
@article{arxiv.2409.14742,
title = {Active control of excitonic strong coupling and electroluminescence in electrically driven plasmonic nanocavities},
author = {Junsheng Zheng and Ruoxue Yang and Alexey V. Krasavin and Zhenxin Wang and Yuanjia Feng and Longhua Tang and Linjun Li and Xin Guo and Daoxin Dai and Anatoly V. Zayats and Limin Tong and Pan Wang},
journal= {arXiv preprint arXiv:2409.14742},
year = {2025}
}