Laser驱动的多铁性和超快自旋电流的产生
Laser-Driven Multiferroics and Ultrafast Spin Current Generation
摘要：
提出了一种利用太赫兹圆偏振激光在一类多铁性磁体中产生自旋手征和自旋电流的超快方法。使用Floquet形式主义的周期性驱动系统，我们表明，它是可以动态控制的Dzyaloshinskiii-Moriya相互作用的材料与磁电耦合。这是支持的数值计算，通过该额外的共振现象被发现。具体地说，当一个静态的磁场施加除了圆偏振激光，一个大的共振增强自旋手性观察类似的电子自旋共振。当激光被手性等离子体结构空间调制时产生自旋电流，并且可以使用光自旋电子器件检测。
英文摘要：
We propose an ultrafast way to generate spin chirality and spin current in a class of multiferroic magnets using a terahertz circularly polarized laser. Using the Floquet formalism for periodically driven systems, we show that it is possible to dynamically control the Dzyaloshinskii-Moriya interaction in materials with magnetoelectric coupling. This is supported by numerical calculations, by which additional resonant phenomena are found. Specifically, when a static magnetic field is applied in addition to the circularly polarized laser, a large resonant enhancement of spin chirality is observed resembling the electron spin resonance. Spin current is generated when the laser is spatially modulated by chiral plasmonic structures and could be detected using optospintronic devices.
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