标题： 非传统磁铁中的Floquet工程自旋三重态状态 显示英文标题

标题： Floquet engineering spin triplet states in unconventional magnets

摘要： 我们研究了具有和不具有自旋单态$s$-波超导性的非常规磁体，并展示了由于光驱动而出现的自旋三重态。特别是，我们发现高频线性偏振光驱动会在$d$-波交替磁体中诱导出一种自旋三重态密度，这种密度在静态情况下不存在，并且可以直接揭示交替磁场的强度。在这一高频范围内，我们还表明线性偏振光能够形成奇频自旋三重态超导关联，这些关联具有$d$-波和$s$-波宇称，可以通过光驱动来控制并通过测量自旋密度来访问。此外，对于低频线性和圆偏振光驱动，我们得出由于存在Floquet能带，超导关联的类型得到了扩展，在$d$-波和$p$-波非常规磁体中出现了自旋三重态配对，而在未驱动相中这些配对是不存在的。 显示英文摘要

摘要： We consider unconventional magnets with and without spin-singlet $s$-wave superconductivity and demonstrate the emergence of spin triplet states due to light drives. In particular, we find that a high-frequency linearly polarized light drive induces a spin-triplet density in $d$-wave altermagnets which does not exist in the static regime and can directly reveal the strength of the altermagnetic field. In this high-frequency regime, we also show that linearly polarized light enables the formation of odd-frequency spin-triplet superconducting correlations possessing $d$-wave and $s$-wave parities, which can be controlled by the light drive and accessed by measuring the spin density. Moreover, for low-frequency linearly and circularly polarized light drives, we obtain that the types of superconducting correlations are broadened due to the presence of Floquet bands, enabling spin-triplet pairs in $d$- and $p$-wave unconventional magnets, which are absent in the undriven phase.