超薄CrSb薄片的交变磁性
Altermagnetism of ultrathin CrSb slabs
AI总结：
通过第一性原理计算研究不同取向超薄CrSb薄片的电子结构，发现(110)取向薄片具有约400 meV的交变磁自旋分裂，是强交变磁性的候选材料。
摘要：
交变磁体表现出动量依赖的自旋分裂而无净磁化，结合了铁磁体和反铁磁体的特性，使其在自旋电子学应用中极具吸引力。CrSb是一个主要候选材料，具有高奈尔温度（~700 K）和约0.6-1 eV的大交换驱动分裂。利用第一性原理计算，我们考虑了超薄极限下不同取向的薄片。我们发现(100)取向的薄片具有自旋简并能带。在(0001)取向的薄片中，交换驱动的交变磁自旋分裂消失，但包括自旋轨道耦合后恢复了约70 meV的残余各向异性分裂。相比之下，(110)取向的薄片显示出约400 meV的交变磁自旋分裂，并成为实现大交换驱动交变磁性的稳健候选材料。
英文摘要：
Altermagnets exhibit momentum-dependent spin splitting without net magnetization, combining characteristics of both ferromagnets and antiferromagnets, making them highly interesting for spintronics applications. CrSb is a prime candidate with a high Néel temperature ($\sim700$~K) and a large exchange-driven splitting of $\sim0.6$--1~eV. Using ab-initio calculations, we consider slabs of various orientations in the ultrathin limit. We find that (100) oriented slabs have spin-degenerate bands. In (0001) oriented slabs, the exchange-driven altermagnetic spin splitting collapses, but including spin-orbit coupling restores a residual anisotropic splitting of $\sim70$~meV. In contrast, the (110) oriented slabs show an altermagnetic spin splitting of $\sim400$~meV, and emerges as a robust candidate for realizing large, exchange-driven altermagnetism
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