Year: 2023
Type: article
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.
Source: Nature Communications
Institutions: Nanyang Technological University, Centre for Disruptive Photonic Technologies, The Photonics Institute, Chinese Academy of Sciences, Institute of Semiconductors, University of Chinese Academy of Sciences, Agency for Science, Technology and Research, Institute of Materials Research and Engineering, University of Science and Technology of China, National University of Singapore, Centre for Quantum Technologies
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,290
OpenAlex ID: W4386837587