Moiré-engineered light-matter interactions in MoS2 /WSe2 heterobilayers at room temperature
Journal article, 2024
Moiré superlattices in van der Waals heterostructures represent a highly tunable quantum system, attracting substantial interest in both many-body physics and device applications. However, the influence of the moiré potential on light-matter interactions at room temperature has remained largely unexplored. In our study, we demonstrate that the moiré potential in MoS2/WSe2 heterobilayers facilitates the localization of interlayer exciton (IX) at room temperature. By performing reflection contrast spectroscopy, we demonstrate the importance of atomic reconstruction in modifying intralayer excitons, supported by the atomic force microscopy experiment. When decreasing the twist angle, we observe that the IX lifetime becomes longer and light emission gets enhanced, indicating that non-radiative decay channels such as defects are suppressed by the moiré potential. Moreover, through the integration of moiré superlattices with silicon single-mode cavities, we find that the devices employing moiré-trapped IXs exhibit a significantly lower threshold, one order of magnitude smaller compared to the device utilizing delocalized IXs. These findings not only encourage the exploration of many-body physics in moiré superlattices at elevated temperatures but also pave the way for leveraging these artificial quantum materials in photonic and optoelectronic applications.
Author
Qiaoling Lin
Technical University of Denmark (DTU)
Hanlin Fang
Technical University of Denmark (DTU)
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology
Alexei Kalaboukhov
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Yuanda Liu
Agency for Science, Technology and Research (A*STAR)
Yi Zhang
Aalto University
Moritz Fischer
Technical University of Denmark (DTU)
Juntao Li
Sun Yat-Sen University
Joakim Hagel
Chalmers, Physics, Condensed Matter and Materials Theory
Samuel Brem
Philipps University Marburg
Ermin Malic
Philipps University Marburg
Nicolas Stenger
Technical University of Denmark (DTU)
Zhipei Sun
Aalto University
Martijn Wubs
Technical University of Denmark (DTU)
Sanshui Xiao
Technical University of Denmark (DTU)
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 15 1 8762Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1038/s41467-024-53083-x
PubMed
39384821