论文标题
通过外场产生二维铁磁电荷密度波
Generating Two-dimensional Ferromagnetic Charge Density Waves via External Fields
论文作者
论文摘要
在实验中尚未发现二维（2D）铁磁电荷密度波（CDW），这是一种探索相关电荷和2D限制的相关电荷和旋转顺序之间的相互交织效果的外来量子状态，尚未在实验中发现。在这里，我们提出了一种可行的策略，可以在外部磁场下实现2D铁磁CDW，使用第一原理计算在单层VSE $ _2 $中进行了证明。在外部拉伸应变下，两个新型的铁磁CDW（$ \ sqrt {3} $$ \ times $ \ times $$ \ sqrt {3} $和2 $ \ times2 \ sqrt {3} $ cdws）可以产生，伴随着可观的磁性v aToms。 Remarkably, because the driving forces for generating these two ferromagnetic CDWs are strongly spin-dependent, fundamentally different from that in conventional CDWs, the $\sqrt{3}$$\times$$\sqrt{3}$ and 2$\times2\sqrt{3}$ CDWs can exhibit two dramatically different half-metallic phases under a large strain range,以及在费米级别附近的平坦带或狄拉克锥。我们提出的策略和材料演示可能打开一扇门，以通过外部田地在集体电荷和旋转订单之间产生和操纵相关效应。
Two-dimensional (2D) ferromagnetic charge density wave (CDW), an exotic quantum state for exploring the intertwining effect between correlated charge and spin orders in 2D limit, has not been discovered in the experiments yet. Here, we propose a feasible strategy to realize 2D ferromagnetic CDWs under external fields, which is demonstrated in monolayer VSe$_2$ using first-principles calculations. Under external tensile strain, two novel ferromagnetic CDWs ($\sqrt{3}$$\times$$\sqrt{3}$ and 2$\times2\sqrt{3}$ CDWs) can be generated, accompanied by distinguishable lattice reconstructions of magnetic V atoms. Remarkably, because the driving forces for generating these two ferromagnetic CDWs are strongly spin-dependent, fundamentally different from that in conventional CDWs, the $\sqrt{3}$$\times$$\sqrt{3}$ and 2$\times2\sqrt{3}$ CDWs can exhibit two dramatically different half-metallic phases under a large strain range, along with either a flat band or a Dirac cone around Fermi level. Our proposed strategy and material demonstration may open a door to generate and manipulate correlation effect between collective charge and spin orders via external fields.
