标题： 光诱导的立方Kondo晶格模型中的磁相变 显示英文标题

标题： Photoinduced magnetic phase transitions in the cubic Kondo-lattice model

摘要： 我们理论研究了立方晶格上的Kondo晶格模型中光诱导的磁相变及其动力学过程。 结果表明，光照引发磁相变，从基态的铁磁态转变为光驱动系统中的非平衡稳态的三维反铁磁态。 这种相变是由于光激发和电子弛豫导致伪半满带占据的形成，其中由交换能隙分隔的上带和下带构成的所有电子态都被部分但几乎均匀地占据。 我们还发现，在动力学相变的瞬态中会出现多种类型的反铁磁关联，例如A型和C型反铁磁关联。 通过计算光驱动系统的磁振子谱，我们认为在对应动量点处磁振子带色散的软化会导致铁磁基态向A型或C型反铁磁态的不稳定性，这取决于光的偏振方向。 我们的发现为理解三维Kondo晶格磁体中的光诱导磁相变提供了重要的见解。 显示英文摘要

摘要： We theoretically study photoinduced magnetic phase transitions and their dynamical processes in the Kondo-lattice model on a cubic lattice. It is demonstrated that light irradiation gives rise to magnetic phase transitions from the ground-state ferromagnetic state to a three-dimensional antiferromagnetic state as a nonequilibrium steady state in the photodriven system. This phase transition occurs as a consequence of the formation of pseudo half-filling band occupation via the photoexcitation and relaxation of electrons, where all the electron states constituting the lower band separated from the upper band by an exchange gap are partially but nearly uniformly occupied. We also find that several types of antiferromagnetic correlations, e.g., A-type and C-type antiferromagnetic correlations, appear in a transient state of the dynamical phase transition. By calculating magnon spectra for the photodriven system, we argue that the instability to the A-type or C-type antiferromagnetic state occurs in the ferromagnetic ground state as a softening of the magnon band dispersion at corresponding momentum points depending on the light polarization. Our findings provide important insights into the understanding of photoinduced magnetic phase transitions in the three-dimensional Kondo-lattice magnets.