论文标题
Moiré磁交换相互作用在扭曲的磁铁中
Moiré Magnetic Exchange Interactions in Twisted Magnets
论文作者
论文摘要
除了Moiré超晶格外，扭曲还可以在Van der Waals磁铁中产生Moiré磁交流（MMEI）。但是，由于极端的复杂性和依赖于角角的灵敏度，所有现有模型都无法捕获MMEI，从而阻止了对MMEIS诱导的新物理学的理解。在这里，我们开发了一种微观MoiréSpinHamiltonian，该微型旋转Hamiltonian可以通过扭曲磁铁中的滑动映射方法对MMEI进行有效描述，如扭曲的双层CRI3中所示。出乎意料的是，我们发现MMEI的出现可以创建一个前所未有的磁性气泡（SKB），其非转化的螺旋性（称为MoiréTypeSKB），代表了MMEI仅产生的独特自旋纹理，并准备在当前的实验条件下检测到。重要的是，SKB的大小和种群可以通过Twist Angle进行精心控制，这是基于天际的量子计算和信息存储的关键步骤。此外，我们揭示了MMEI可以通过底物诱导的界面Dzyaloshinskii-Moriya的相互作用来有效地操纵MMEI，从而调节了依赖扭曲角依赖性的磁相图，从而解决了先验理论和实验之间的杰出分歧，并验证了我们的论点。
Besides moiré superlattice, twisting can also generate moiré magnetic exchange interactions (MMEIs) in van der Waals magnets. However, due to the extreme complexity and twist-angle-dependent sensitivity, all existing models fail to capture the MMEIs, preventing the understanding of MMEIs-induced new physics. Here, we develop a microscopic moiré spin Hamiltonian that enables the effective description of MMEIs via a sliding-mapping approach in twisted magnets, as demonstrated in twisted bilayer CrI3. Unexpectedly, we discover that the emergence of MMEIs can create an unprecedented magnetic skyrmion bubble (SkB) with non-conversed helicity, named as moiré-type SkB, representing a unique spin texture solely generated by MMEIs and ready to be detected under the current experimental conditions. Importantly, the size and population of SkBs can be finely controlled by twist angle, a key step for skyrmion-based quantum computing and information storage. Furthermore, we reveal that the MMEIs can be effectively manipulated by the substrate-induced interfacial Dzyaloshinskii-Moriya interaction, modulating the twist-angle-dependent magnetic phase diagram, which solves the outstanding disagreements between prior theories and experiments and verifies our theory.
