具有面内磁化的铁能谷电子学
Ferro-Valleytricity with In-Plane Magnetization
AI总结：
提出一种在面内磁化二维材料中实现铁能谷电子学的机制，并在单层 W3Cl8 中通过第一性原理验证其可由磁化偏移或电场调控反转。
摘要：
铁能谷电子学是一种表现为自发能谷极化的基本现象，通常被认为发生在具有面外磁化的二维（2D）材料中。在此，我们提出一种在具有面内磁化的二维材料中实现铁能谷电子学的机制，其物理机制与三角晶格中的非共线磁性相关。我们的模型分析给出了允许面内铁能谷电子学存在的完整要素，揭示出显著的能谷极化需要镜面对称性，并且应当排除时间反演-镜面联合对称性。通过调节面内磁化偏移，能谷极化可以被反转。随后通过第一性原理计算，该机制在单层 W3Cl8 的多铁性三角晶格中得到验证。我们进一步表明，能谷极化的反转也可以通过施加电场来调节铁电性而实现。我们的发现极大地丰富了能谷物理研究，并显著拓展了铁能谷电子学材料类别的范围。
英文摘要：
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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