Bright dipolar excitons in twisted black phosphorus homostructures

• 成果类型: Article
• 署名作者: Huang, Shenyang; Yu, Boyang; Ma, Yixuan; Pan, Chenghao; Ma, Junwei; Zhou, Yuxuan; Ma, Yaozhenghang; Yang, Ke; Wu, Hua; Lei, Yuchen; Xing, Qiaoxia; Mu, Lei; Zhang, Jiasheng; Mou, Yanlin; Yan, Hugen
• 署名单位: Fudan University; Fudan University; Fudan University; Fudan University; University of Shanghai for Science & Technology; Shanghai Qi Zhi Institute
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13817
• DOI: 10.1126/science.adq2977
• 发表日期: 2024-11-01
• 页码: 526-531
• 关键词: electrical control; DYNAMICS; liquid

摘要

Bright dipolar excitons, which contain electrical dipoles and have high oscillator strength, are an ideal platform for studying correlated quantum phenomena. They usually rely on carrier tunneling between two quantum wells or two layers to hybridize with nondipolar excitons to gain oscillator strength. In this work, we uncovered a new type of bright infrared dipolar exciton by stacking 90 degrees-twisted black phosphorus (BP) structures. These excitons, inherent to the reconstructed band structure, exhibit high oscillator strength. Most importantly, they inherit the linear polarization from BP, which allows light polarization to be used to select the dipole direction. Moreover, the dipole moment and resonance energy can be widely tuned by the thickness of the BP. Our results demonstrate a useful platform for exploring tunable correlated dipolar excitons.