论文标题
一类新的固有磁铁：二维Yttrium Sulphur Selenide
A new class of intrinsic magnet: two-dimensional yttrium sulphur selenide
论文作者
论文摘要
探索和控制二维（2D）分层磁性晶体及其在异质组件中的磁性，为基本科学和技术提供了前所未有的机会。然而，迄今为止，只有少数已知的内在2D磁铁。在这里，我们预测使用第一原理计算的新型2D固有磁铁Yttrium Selenide（YSSE）。这种过渡金属二进制基因源的磁性起源于chalcogens的部分填充$ 3p $ - 和$ 4p $ - 欧洲的欧洲，这与其他已知的固有磁铁不同，磁性来自部分填充的$ 3D $ - 和$ 4F $ -ORBITALS。 YSSE中的非常规磁性是其结构和电子特性独特组合的结果。我们进一步表明，缺乏镜子对称性会导致压电性能，而损坏的空间和时间对称性可确保山谷极化。 YSSE是一种罕见的磁性pizoeleclecelectric材料，可以实现新颖的自旋形式，valleytronics和Quantum Technologies。
Exploring and controlling magnetism in two-dimensional (2D) layered magnetic crystals, as well as their inclusion in heterogeneous assemblies, provide an unprecedented opportunity for fundamental science and technology. To date, however, there are only a few known intrinsic 2D magnets. Here we predict a novel 2D intrinsic magnet, yttrium sulfur selenide (YSSe), using first-principles calculations. The magnetism of this transition metal dichalcogenide originates from the partially-filled $3p$- and $4p$-orbitals of the chalcogens, unlike other known intrinsic magnets where magnetism arises from the partially-filled $3d$- and $4f$-orbitals. The unconventional magnetism in YSSe is a result of a unique combination of its structural and electronic properties. We further show that a lack of mirror symmetry results in piezoelectric properties, while the broken space- and time-symmetry ensures valley polarization. YSSe is a rare magnetic-piezoelectric material that can enable novel spintronics, valleytronics, and quantum technologies.
