标题： d波交替磁体中的自旋恶魔 显示英文标题

标题： Spin demons in d-wave altermagnets

摘要： 反粒子是一种等离子体，由不同能带中电子的反相振荡组成。 在这里，我们表明，$d$波反铁磁体，一种最近发现的线性磁性类别，自然实现了自旋反粒子，该反粒子由两种自旋种类的反相运动组成。 自旋反粒子位于其中一种自旋种类的粒子-空穴连续谱之外，因此显著阻尼较小，达到$>10$的质量因子。 我们证明自旋反粒子携带一个磁矩，该磁矩继承了$d$波的对称性。 最后，我们考虑了三维和二维的$d$波反铁磁体，并表明自旋反粒子在两者中都存在。 显示英文摘要

摘要： Demons are a type of plasmons, which consist of out-of-phase oscillations of electrons in different bands. Here, we show that $d$-wave altermagnets, a recently discovered class of collinear magnetism, naturally realize a spin demon, which consists of out-of-phase movement of the two spin species. The spin demon lives outside of the particle-hole continuum of one of the spin species, and is therefore significantly underdamped, reaching quality factors of $>10$. We show that the spin demon carries a magnetic moment, which inherits the $d$-wave symmetry. Finally, we consider both three and two dimensional $d$-wave altermagnets, and show that spin demons exists in both.