Electronic Ferroelectricity in Monolayer Graphene Moiré Superlattices
Author Information
Author(s): Zhang Le, Ding Jing, Xiang Hanxiao, Liu Naitian, Zhou Wenqiang, Wu Linfeng, Xin Na, Watanabe Kenji, Taniguchi Takashi, Xu Shuigang
Primary Institution: Westlake University
Hypothesis
Can monolayer graphene exhibit ferroelectricity when asymmetric moiré superlattices are introduced?
Conclusion
The study demonstrates that monolayer graphene can exhibit electronic ferroelectricity through the introduction of asymmetric moiré superlattices.
Supporting Evidence
- Monolayer graphene typically does not exhibit ferroelectric order due to its symmetrical structure.
- The introduction of asymmetric moiré superlattices allows for the observation of electronic ferroelectricity.
- Polarization switching was observed through Hall carrier density measurements.
- Ferroelectricity was found to be present in monolayer, bilayer, and trilayer graphene, indicating layer polarization is not essential.
- The findings suggest potential applications in nonvolatile data storage and synaptic devices.
Takeaway
Scientists found that a special arrangement of graphene can make it act like a material that can switch its electric charge, which is useful for new types of memory devices.
Methodology
The researchers created devices from monolayer graphene and measured their electrical properties under various conditions to observe ferroelectric behavior.
Digital Object Identifier (DOI)
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