Engineering Second-Order Corner States in 2D Multiferroics,Small

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Engineering Second-Order Corner States in 2D Multiferroics
Small ( IF 13.0 ) Pub Date : 2023-01-15 , DOI: 10.1002/smll.202206574
Yingxi Bai ₁ , Ning Mao ₁ , Runhan Li ₁ , Ying Dai ₁ , Baibiao Huang ₁ , Chengwang Niu ₁

Affiliation

The understanding and manipulate of the second-order corner states are central to both fundamental physics and future topotronics applications. Despite the fact that numerous second-order topological insulators (SOTIs) are achieved, the efficient engineering in a given material remains elusive. Here, the emergence of 2D multiferroics SOTIs in SbAs and BP₅ monolayers is theoretically demonstrated, and an efficient and straightforward way for engineering the nontrivial corner states by ferroelasticity and ferroelectricity is remarkably proposed. With ferroelectric polarization of SbAs and BP₅ monolayers, the nontrivial corner states emerge in the mirror symmetric corners and are perpendicular to orientations of the in-plane spontaneous polarization. And remarkably the spatial distribution of the corner states can be effectively tuned by a ferroelastic switching. At the intermediate states of both ferroelectric and ferroelastic switchings, the corner states disappear. These finding not only combines exotic SOTIs with multiferroics but also pave the way for experimental discovery of 2D tunable SOTIs.

中文翻译：

二维多铁性中的工程二阶角态

对二阶角态的理解和操纵是基础物理学和未来拓扑电子学应用的核心。尽管实现了许多二阶拓扑绝缘体 (SOTI)，但在给定材料中的有效工程仍然难以实现。_{在这里，从理论上证明了 SbAs 和 BP 5}单层中二维多铁性 SOTI 的出现，并显着提出了一种通过铁弹性和铁电性设计非平凡角态的有效且直接的方法。具有 SbAs 和 BP _{5的铁电极化}单层，非平凡的角态出现在镜像对称的角中，并且垂直于面内自发极化的方向。值得注意的是，角态的空间分布可以通过铁弹性开关进行有效调整。在铁电和铁弹性切换的中间状态，角状态消失。这些发现不仅将奇异的 SOTI 与多铁性相结合，而且还为二维可调 SOTI 的实验发现铺平了道路。

更新日期：2023-01-15

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