拓结构在拉伸的铁电膜中的巨大压电效应
Yihao Hu1, Jiyuan Yang1, Shi Liu1,2
1Key Laboratory for Quantum Materials of Zhejiang Province, Department of Physics, School of Science, <a href="https://ror.org/05hfa4n20">Westlake University</a>, Hangzhou, Zhejiang 310024, China.
Physical review letters
|August 9, 2024
概括
独立的铁电氧化物膜表现出新的域结构和由于应变诱导的双极旋转而增强的压电性. 一个独特的"双极螺旋"结构显示了巨大的压电反应,为合声波动力学开辟了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 固态化学 固态化学
背景情况:
- 独立的铁电氧化物膜提供了一个可调节的平台,用于研究拓极点排序和二极相互作用.
- 应变工程是控制铁电材料属性的关键方法.
研究的目的:
- 研究铁电氧化物膜中应变驱动的相变和由此产生的域结构.
- 阐明拉伸铁电膜中增强压电反应背后的机制.
- 识别新的铁电拓结构及其属性.
主要方法:
- 密度函数理论 (DFT) 模拟用于预测相位边界.
- 深度学习辅助的分子动力学模拟来分析动态结构.
- 对域结构,双极方向和域壁动态的分析.
主要成果:
- 应变驱动的形态相界限在室温下表现为多样化,动态的域结构.
- 在拉伸的PbTiO3膜中增强的压电响应归因于域壁双极旋转.
- 一个发现的发现.
- 这是一个双极螺旋螺旋.
- 铁电拓结构具有巨大的内在压电反应 (>320 pC/N).
结论:
- 铁电膜在应力下表现出复杂的域动态,从而产生独特的特性.
- 这是一个很棒的节目,这是一个很棒的节目.
- 这是一个双极螺旋螺旋.
- 结构代表了一类新的铁电拓现象.
- 这一发现为探索性声动力学和新的双极相互作用铺平了道路.
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