Interlayer donor-acceptor pair excitons in MoSe2/WSe2 moiré heterobilayer

Hongbing Cai, Abdullah Rasmita, Qinghai Tan, Jia-Min Lai, Ruihua He, Xiangbin Cai, Yan Zhao, Disheng Chen, Naizhou Wang, Zhao Mu, Zumeng Huang, Zhaowei Zhang, John J. H. Eng, Yuanda Liu, Yongzhi She, Nan Pan, Yansong Miao, Xiaoping Wang, Xiaogang Liu, Jun Zhang () and Weibo Gao ()
Additional contact information
Hongbing Cai: Nanyang Technological University
Abdullah Rasmita: Nanyang Technological University
Qinghai Tan: Nanyang Technological University
Jia-Min Lai: Chinese Academy of Sciences
Ruihua He: Nanyang Technological University
Xiangbin Cai: Nanyang Technological University
Yan Zhao: Nanyang Technological University
Disheng Chen: Nanyang Technological University
Naizhou Wang: Nanyang Technological University
Zhao Mu: Nanyang Technological University
Zumeng Huang: Nanyang Technological University
Zhaowei Zhang: Nanyang Technological University
John J. H. Eng: Nanyang Technological University
Yuanda Liu: Nanyang Technological University
Yongzhi She: University of Science and Technology of China
Nan Pan: University of Science and Technology of China
Yansong Miao: Nanyang Technological University
Xiaoping Wang: University of Science and Technology of China
Xiaogang Liu: National University of Singapore
Jun Zhang: Chinese Academy of Sciences
Weibo Gao: Nanyang Technological University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Localized interlayer excitons (LIXs) in two-dimensional moiré superlattices exhibit sharp and dense emission peaks, making them promising as highly tunable single-photon sources. However, the fundamental nature of these LIXs is still elusive. Here, we show the donor-acceptor pair (DAP) mechanism as one of the origins of these excitonic peaks. Numerical simulation results of the DAP model agree with the experimental photoluminescence spectra of LIX in the moiré MoSe2/WSe2 heterobilayer. In particular, we find that the emission energy-lifetime correlation and the nonmonotonic power dependence of the lifetime agree well with the DAP IX model. Our results provide insight into the physical mechanism of LIX formation in moiré heterostructures and pave new directions for engineering interlayer exciton properties in moiré superlattices.

Date: 2023
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DOI: 10.1038/s41467-023-41330-6

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