journal article·2023-06

Moiré Enhanced Potentials in Twisted Transition Metal Dichalcogenide Trilayers Homostructures

Haihong Zheng, Biao Wu, Chang‐Tian Wang, Shaofei Li, Jun He, Zongwen Liu, Jian‐Tao Wang, Ji‐an Duan, Yanping Liu

Small· Volume 19· Issue 26
Publisher page

Abstract

Abstract 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.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physics and Electronics Hunan Key Laboratory for Super‐microstructure and Ultrafast Process Central South University 932 South Lushan Road Changsha Hunan 410083 People's Republic of China

State Key Laboratory of High‐Performance Complex Manufacturing Central South University 932 South Lushan Road Changsha Hunan 410083 People's Republic of China

Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 People's Republic of China

School of Chemical and Biomolecular Engineering The University of Sydney Sydney NSW 2006 Australia

The University of Sydney Nano Institute The University of Sydney Sydney NSW 2006 Australia

Songshan Lake Materials Laboratory Dongguan Guangdong 523808 People's Republic of China

Shenzhen Research Institute of Central South University Shenzhen 518057 People's Republic of China

Funding

National Natural Science Foundation of China · Central South University · Australian Research Council

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