操作式电子显微镜检查扭曲的范德瓦尔斯同类生物中的极域动态
Kahyun Ko1, Ayoung Yuk1, Rebecca Engelke2
1Department of Physics, Sogang University, Seoul, Republic of Korea.
Nature materials
|June 26, 2023
概括
扭曲的WSe2表现出独特的抗铁电行为,受到域壁的保护. 减少扭转角度使铁电过渡成为可能,揭示了范德瓦尔斯铁电装置速度至关重要的域壁动态.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 传统的抗铁电材料在电场下过渡到铁电相.
- 范德瓦尔斯晶体中的莫伊尔超级格子显示带有反对齐二极体的极域,形成一个莫伊尔域反铁电 (MDAF) 排列.
- MDAF的布局不同于二维铁电,这表明了独特的域动态.
研究的目的:
- 用操作式传输电子显微镜研究双层WSe2中扭曲双层的实时极域动态.
- 了解影响从MDAF过渡到铁电相的因素.
- 测量域壁速度,并识别范德瓦尔斯铁电器中的固定机制.
主要方法:
- 在扭曲的双层 WSe2.2 上运行传输电子显微镜 (TEM).
- 强光镜TEM用于观察铁电相中的域动态.
- 对域壁固定障碍的原子尺度分析.
主要成果:
- 对域墙网络的拓保护可以防止扭曲双层 WSe2.2 中的 MDAF 到铁电过渡.
- 减少扭转角度导致域壁网络的消失,并促进MDAF到铁电过渡.
- 在铁电阶段测量了300μm/s的最大域壁速度.
- 由于障碍导致的域壁固定限制了速度,并在歇斯底里循环中引起巴克豪森噪声.
结论:
- 域墙网络在稳定扭曲的WSe2.2中的抗铁电相方面发挥着至关重要的作用.
- 了解和减轻域墙固定对于提高范德瓦尔斯铁电器的开关速度至关重要.
- 对固定障碍的原子级洞察力为设计更快的铁电器件提供了途径.
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