Observation of Rydberg moire excitons

• 成果类型: Article
• 署名作者: Hu, Qianying; Zhan, Zhen; Cui, Huiying; Zhang, Yalei; Jin, Feng; Zhao, Xuan; Zhang, Mingjie; Wang, Zhichuan; Zhang, Qingming; Watanabe, Kenji; Taniguchi, Takashi; Cao, Xuewei; Liu, Wu-Ming; Wu, Fengcheng; Yuan, Shengjun; Xu, Yang
• 署名单位: Chinese Academy of Sciences; Institute of Physics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Nankai University; Wuhan University; IMDEA Nanociencia; Lanzhou University; National Institute for Materials Science; National Institute for Materials Science
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10663
• DOI: 10.1126/science.adh1506
• 发表日期: 2023-06-30
• 页码: 1367-1372
• 关键词: transitions; cascade; STATES

摘要

Rydberg excitons, the solid-state counterparts of Rydberg atoms, have sparked considerable interest with regard to the harnessing of their quantum application potentials, but realizing their spatial confinement and manipulation poses a major challenge. Lately, the rise of two-dimensional moire superlattices with highly tunable periodic potentials provides a possible pathway. Here, we experimentally demonstrate this capability through the spectroscopic evidence of Rydberg moire excitons (X-RM), which are moire-trapped Rydberg excitons in monolayer semiconductor tungsten diselenide adjacent to twisted bilayer graphene. In the strong coupling regime, the X-RM manifest as multiple energy splittings, pronounced red shift, and narrowed linewidth in the reflectance spectra, highlighting their charge-transfer character wherein electron-hole separation is enforced by strongly asymmetric interlayer Coulomb interactions. Our findings establish the excitonic Rydberg states as candidates for exploitation in quantum technologies.