涌现的$d$-波交替磁性在正交扭曲双层CrPS$_4$中
Emergent $d$-wave altermagnetism in orthogonally twisted bilayer CrPS$_4$
AI总结：
研究通过正交扭曲双层CrPS$_4$展现由结构旋转驱动的$d$-波交替磁性，结合对称性分析和第一性原理计算，揭示了非相对论自旋分裂和高效自旋-电荷转换机制。
摘要：
Twistronics是通过控制层状材料之间的相对取向来工程新量子态的强大策略。本文展示正交扭曲双层CrPS$_4$中由结构旋转纯驱动的$d$-波交替磁性。对称性分析表明，扭曲堆叠破坏部分平移与时间反演对称性，导致相反自旋子晶格间四重旋转关系，从而实现交替磁性。第一性原理计算显示费米能级附近非相对论自旋分裂高达68 meV。进一步表明，通过层间压缩和调节局域库仑相互作用可稳定交替磁态。所获能带结构表现出显著的自旋依赖各向异性，使自旋到电荷转换效率达到费米能级附近约50%，并产生显著的巨磁阻效应。这些结果确立了扭曲CrPS$_4$作为交替磁性的现实平台，并突显了twistronics作为先进自旋电子学应用的多功能路线。
英文摘要：
Twistronics is a powerful strategy to engineer novel quantum states by controlling the relative orientation between layered materials. Here, we demonstrate that an orthogonally twisted bilayer CrPS$_4$ shows $d$-wave altermagnetism driven purely by structural rotation. Symmetry analysis reveals that the twisted stacking breaks partial translational combined with time-reversal symmetry, leading to a fourfold rotation relation between opposite spin sublattices, enabling altermagnetism. First-principles calculations demonstrate a sizable non-relativistic spin splitting of up to 68 meV around the Fermi level. We further show that the altermagnetic state can be further stabilized through interlayer compression and modulation of the on-site Coulomb interaction. The resulting band structure exhibits pronounced spin-dependent anisotropy, enabling efficient spin to charge conversion reaching $\sim$50% near the Fermi level and sizable giant magnetoresistance. These results establish twisted CrPS$_4$ as a realistic platform for altermagnetism and highlights twistronics as a versatile route for advanced spintronics applications.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
