Moiré Enhanced Potentials in Twisted Transition Metal Dichalcogenide Trilayers Homostructures

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 19; no. 26; pp. e2207988 - n/a
• Main Authors: Zheng, Haihong, Wu, Biao, Wang, Chang‐Tian, Li, Shaofei, He, Jun, Liu, Zongwen, Wang, Jian‐Tao, Duan, Ji‐an, Liu, Yanping
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.06.2023
• Subjects: Atomic structure; Chalcogenides; Circular polarization; Excitons; moiré potential; moiré superlattices; Nanotechnology; Quantum phenomena; Transition metal compounds; transition metal dichalcogenide; twisted van der Waals heterostructures; WSe 2 homotrilayers; twisted van der Waals heterostructures; transition metal dichalcogenide; moiré potential; WSe 2 homotrilayers; moiré superlattices
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.202207988

The exploration of moiré superlatticesholds promising potential to uncover novel quantum phenomena emerging from the interplay of atomic structure and electronic correlation . However, the impact of the moiré potential modulation on the number of twisted layers has yet to be experimentally explored. Here, this work synthesizes a twisted WSe2 homotrilayer using a dry‐transfer method and investigates the enhancement of the moiré potential with increasing number of twisted layers. The results of the study reveal the presence of multiple exciton resonances with positive or negative circularly polarized emission in the WSe2 homostructure with small twist angles, which are attributed to the excitonic ground and excited states confined to the moiré potential. The distinct g‐factor observed in the magneto‐optical spectroscopy is also shown to be a result of the confinement of the exciton in the moiré potential. The moiré potential depths of the twisted bilayer and trilayer homostructures are found to be 111 and 212 meV, respectively, an increase of 91% from the bilayer structure. These findings demonstrate that the depth of the moiré potential can be manipulated by adjusting the number of stacked layers, providing a promising avenue for exploration into highly correlated quantum phenomena. The study highlights the enhanced moiré potential in twisted trilayer homostructures of transition metal dichalcogenides. Adjusting the number of stacked layers leads to multiple exciton resonances with different circular polarization and g‐factor, indicating controllable moiré potential. This discovery presents a new preparation method for moiré potentials, which paves the way for exploring highly correlated quantum phenomena.