论文标题
Moiré驱动的多效量订单中的扭曲CRCL $ _3 $，CRBR $ _3 $和CRI $ _3 $ BILAYERS
Moiré-driven multiferroic order in twisted CrCl$_3$, CrBr$_3$ and CrI$_3$ bilayers
论文作者
论文摘要
分层的范德华材料已成为一个强大的平台，用于设计物质的人工竞争状态。在这里，我们展示了扭曲的三哈里德郡双层铬中多种秩序的出现，该秩序完全由Moiré模式驱动，而在对齐的多层中不存在。使用自旋模型和从头算计算的结合，我们表明，由于堆叠依赖性依赖性层间磁性交换与磁各向异性之间的竞争，在扭曲系统的Moiré超级电池中生成了自旋纹理。由于旋转轨道耦合，导致这种非连续性磁态引起的电化极化，导致莫伊尔之后的局部铁电顺序出现。在三肠甲酯的体系计量学中，我们的结果表明，扭曲的crbr $ _3 $双层产生了最强大的多效率。我们进一步显示了强磁耦合的出现，该耦合允许磁性天空的发电和控制。我们的结果提出了扭曲的Trihalide双层铬，尤其是CRBR $ _3 $ BiLayers，是设计人造多效材料和电气可调的拓扑磁性纹理的强大平台。
Layered van der Waals materials have risen as a powerful platform to engineer artificial competing states of matter. Here we show the emergence of multiferroic order in twisted chromium trihalide bilayers, an order fully driven by the moiré pattern and absent in aligned multilayers. Using a combination of spin models and ab initio calculations, we show that a spin texture is generated in the moiré supercell of the twisted system as a consequence of the competition between stacking-dependent interlayer magnetic exchange and magnetic anisotropy. An electric polarization arises associated with such a non-collinear magnetic state due to the spin-orbit coupling, leading to the emergence of a local ferroelectric order following the moiré. Among the stochiometric trihalides, our results show that twisted CrBr$_3$ bilayers give rise to the strongest multiferroic order. We further show the emergence of a strong magnetoelectric coupling, which allows the electric generation and control of magnetic skyrmions. Our results put forward twisted chromium trihalide bilayers, and in particular CrBr$_3$ bilayers, as a powerful platform to engineer artificial multiferroic materials and electrically tunable topological magnetic textures.
