Large coupling strengths in exciton-photon interactions are important for quantum photonic network, while strong cavity-quantum-dot interactions have been focused on s-shell excitons with small coupling strengths. Here we demonstrate strong interactions between cavities and p-shell excitons with a great enhancement by the \textit{in situ} wave-function control. The p-shell excitons are demonstrated with much larger wave-function extents and nonlocal interactions beyond the dipole approximation. Then the interaction is tuned from the nonlocal to local regime by the wave-function shrinking, during which the enhancement is obtained. A large coupling strength of 210μeV has been achieved, indicating the great potential of p-shell excitons for coherent information exchange. Furthermore, we propose a distributed delay model to quantitatively explain the coupling strength variation, revealing the intertwining of excitons and photons beyond the dipole approximation.
@article{arxiv.1902.11011,
title = {Enhanced Strong Interaction between Nanocavities and p-shell Excitons Beyond the Dipole Approximation},
author = {Chenjiang Qian and Xin Xie and Jingnan Yang and Kai Peng and Shiyao Wu and Feilong Song and Sibai Sun and Jianchen Dang and Yang Yu and Matthew J. Steer and Iain G. Thayne and Kuijuan Jin and Changzhi Gu and Xiulai Xu},
journal= {arXiv preprint arXiv:1902.11011},
year = {2019}
}