手征双二次对相互作用
The chiral biquadratic pair interaction
摘要：
磁相互作用支撑着物质的大量磁态，因此在基础物理学和未来的自旋电子学和量子计算设备中发挥着核心作用。Dzyaloshinskiii-Moriya相互作用是手性的，由相对论效应驱动，导致高度非共线的自旋纹理的稳定，如skyrmions，由于它们的拓扑性质，它们是磁数据存储和处理元件的有前途的构建块。在这里，我们揭示和研究了一种新的手性对相互作用，这是Dzyaloshinskiii-Moriya相互作用的双二次等价物。首先，我们从微观模型中推导出这种相互作用及其指导原则。其次，我们研究了它的性质，在最简单的原型系统，磁性二聚体沉积在各种基板上，诉诸系统的第一性原理计算。最后，我们讨论了它的重要性和影响，不仅为磁性二聚体，但也为扩展系统，即一维自旋螺旋和复杂的二维磁结构，如nanoskyrmion晶格。
英文摘要：
Magnetic interactions underpin a plethora of magnetic states of matter, hence playing a central role both in fundamental physics and for future spintronic and quantum computation devices. The Dzyaloshinskii-Moriya interaction, being chiral and driven by relativistic effects, leads to the stabilization of highly-noncollinear spin textures such as skyrmions, which thanks to their topological nature are promising building blocks for magnetic data storage and processing elements. Here, we reveal and study a new chiral pair interaction, which is the biquadratic equivalent of the Dzyaloshinskii-Moriya interaction. First, we derive this interaction and its guiding principles from a microscopic model. Second, we study its properties in the simplest prototypical systems, magnetic dimers deposited on various substrates, resorting to systematic first-principles calculations. Lastly, we discuss its importance and implications not only for magnetic dimers but also for extended systems, namely one-dimensional spin spirals and complex two-dimensional magnetic structures, such as a nanoskyrmion lattice.
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