具有平面内磁化的铁谷性

Yibo Liu, Yangyang Feng, Ying Dai, Baibiao Huang, Yandong Ma
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引用次数: 0

摘要

铁谷性是一种表现自发谷极化的基本现象,通常被认为发生在平面外磁化的二维(2D)材料中。在这里,我们提出了一种在具有面内磁化的二维材料中实现铁谷性的机制,其中的物理学原理与三角形晶格中的非共线磁性相关。我们的模型分析提供了实现面内磁化铁谷性的综合成分,揭示了显著的谷极化需要镜像对称性,并且应排除时间反转镜像联合对称性。通过调节面内磁化偏移,可以逆转谷极化。根据第一性原理,我们在单层 W3Cl8 的多铁三角形晶格中演示了这种机制。我们进一步证明,谷极化反转也可以通过施加电场来驱动,从而调节铁电性。我们的发现极大地丰富了谷物物理学研究的内容,并大大扩展了铁电谷性材料类别的范围。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ferro-Valleytricity with In-Plane Magnetization
Ferro-valleytricity, a fundamental phenomenon that manifests spontaneous valley polarization, is generally considered to occur in two-dimensional (2D) materials with out-of-plane magnetization. Here, we propose a mechanism to realize ferro-valleytricity in 2D materials with in-plane magnetization, wherein the physics correlates to non-collinear magnetism in triangular lattice. Our model analysis provides comprehensive ingredients that allows for in-plane ferro-valleytricity, revealing that mirror symmetry is required for remarkable valley polarization and time-reversal-mirror joint-symmetry should be excluded. Through modulating in-plane magnetization offset, the valley polarization could be reversed. Followed by first-principles, such mechanism is demonstrated in a multiferroic triangular lattice of single-layer W3Cl8. We further show that the reversal of valley polarization could also be driven by applying electric field that modulates ferroelectricity. Our findings greatly enrich the valley physics research and significantly extend the scope for material classes of ferro-valleytricity.
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