Laser-induced magnetization curve
Laser-induced magnetization curve
复制标题
激光诱导磁化曲线
DOI：
10.1103/physrevb.90.214413
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发表时间：
2015
影响因子：
3.7
通讯作者：
Masahiro Sato and Takashi Oka
中科院分区：
文献类型：
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作者：
Shintaro Takayoshi;Masahiro Sato and Takashi Oka
我们提出了一种利用圆偏振太赫兹激光器对普通量子磁体进行高磁化的全光超快方法。其关键思想是利用圆偏振激光及其啁啾。通过这种方法，即使在没有任何静态磁场的情况下，也可以得到一大类量子磁体的磁化强度随时间的变化曲线。我们在真实的量子自旋模型中数值演示了激光诱导磁化过程，并找到了实现的条件。磁化的开始可以用Landau-Zener机制的多体版本来描述。在一个特定的模型中，我们证明了具有拓扑性质的平台态可以动态实现。
We propose an all optical ultrafast method to highly magnetize general quantum magnets using a circularly polarized terahertz laser. The key idea is to utilize a circularly polarized laser and its chirping. Through this method, one can obtain magnetization curves of a broad class of quantum magnets as a function of timeeven without any static magnetic field. We numerically demonstrate the laser-induced magnetization process in realistic quantum spin models and find a condition for the realization. The onset of magnetization can be described by a many-body version of Landau-Zener mechanism. In a particular model, we show that a plateau state with topological properties can be realized dynamically.