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在PbTiO₃和SrTiO₃单层和双层中对多态和铁电的化学控制

Shaowen Xu^1,2, Jeffrey R Reimers^1,3, Fanhao Jia^1,4

¹Physics Department, International Centre of Quantum and Molecular Structures, Shanghai University, Shanghai 200444, China. Jeffrey.reimes@uts.edu.au.

Physical chemistry chemical physics : PCCP

|September 17, 2025

概括

铁电在二维矿二层中是通过键交换控制的,使得可调节的极化. 这一发现通过操纵应变和结构为新型电子设备提供了途径.

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:

矿材料表现出高对称性的结构扭曲,导致可利用的双极极化.
这些扭曲对于各种电子设备中的应用至关重要.
了解这些扭曲是控制材料属性的关键.

研究的目的:

研究二维矿二层中控制铁电的机制.
探索纽带动态和结构转换在极化切换中的作用.
为了确定操纵先进材料中的铁电性质的途径.

主要方法:

密度功能理论 (DFT) 的计算被用来建模PbTiO3和SrTiO3双层.
分析的重点是结构放松和应力应用期间的键断裂和形成过程.
为了阐明扭曲机制,确定了中间对称结构.

主要成果:

铁电在二维矿二层中是由键断裂和形成的二元切换控制的.
堆叠依赖的过程,受到放松和双轴应变的影响,控制极化切换.
中间对称结构揭示了内在的铁扭曲和反铁扭曲八面体扭曲.
极化切换是由四个控制键动态的角度变量驱动的.

结论:

在二维矿中铁电极化切换是一个复杂的过程,涉及协调的键动态.
鉴定出来的机制提供了对这些材料中铁电性的基本理解.
对化学环境和温度的敏感性为未来的设备应用提供了机会.

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