Rydberg excitons, the solid-state counterparts of Rydberg atoms, have sparked considerable interest in harnessing their quantum application potentials, whereas a major challenge is realizing their spatial confinement and manipulation. Lately, the rise of two-dimensional moir\'e superlattices with highly tunable periodic potentials provides a possible pathway. Here, we experimentally demonstrate this capability through the observation of Rydberg moir\'e excitons (XRM), which are moir\'e trapped Rydberg excitons in monolayer semiconductor WSe2 adjacent to twisted bilayer graphene. In the strong coupling regime, the XRM manifest as multiple energy splittings, pronounced redshift, and narrowed linewidth in the reflectance spectra, highlighting their charge-transfer character where electron-hole separation is enforced by the strongly asymmetric interlayer Coulomb interactions. Our findings pave the way for pursuing novel physics and quantum technology exploitation based on the excitonic Rydberg states.
@article{arxiv.2303.09844,
title = {Observation of Rydberg moir\'e excitons},
author = {Qianying Hu and Zhen Zhan and Huiying Cui and Yalei Zhang and Feng Jin and Xuan Zhao and Mingjie Zhang and Zhichuan Wang and Qingming Zhang and Kenji Watanabe and Takashi Taniguchi and Xuewei Cao and Wu-Ming Liu and Fengcheng Wu and Shengjun Yuan and Yang Xu},
journal= {arXiv preprint arXiv:2303.09844},
year = {2023}
}
Comments
24 pages, including 4 figures and 6 supplementary figures