论文标题
van der waals中心对称材料的Skyrmions与Dzyaloshinskii-Moriya相互作用
Skyrmions in van der Waals centrosymmetric materials with Dzyaloshinskii-Moriya interactions
论文作者
论文摘要
由于非散布的Dzyaloshinskii-Moriya相互作用（DMI），因此可以在非中心对称材料中出现天际。在本文中，我们研究了rombohedral MX $ _ {3} $（M：V，Cr，Mn和Fe。X：Cl，Br，Br和I）范德华材料，通过结合首先PRINCIPLES计算和Monte Carlo Simulations。我们发现，由于局部反转对称性破坏了局部反转对称性，我们发现作用于层内第二个邻居位点之间的dzyaloshinskii-moriya矢量也不为零，而且也很大。我们发现，大型DMI会导致纳米级磁性涡旋，以Mx $ _ {3} $中所谓的Skyrmions。 Skyrmions的直径，例如，在Crcl $ _ {3} $中，很小，即2 nm，这对于应用高密度磁性存储器设备的应用是有希望的。我们还发现，不仅在crcl $ _ {3} $和vcl $ _ {3} $中的传统天空阵线，还出现了fecl $ _ {3} $中的抗fiferromagnetic skyrmions和mncl $ _ {3} $的梅隆。此外，我们发现Clcl $ _ {3} $和Vcl $ _ {3} $中的Skyrmions具有不同的螺旋性，这表明了通过MX $ _ {3} $材料控制电子/孔掺杂的螺旋性的可能性。范德华的材料在异质结构和扭曲结构等结构中具有很高的自由度优势，它表现出很高的潜力作为天际材料。
Skyrmions can appear in non-centrosymmetric material because of the non-vanishing Dzyaloshinskii-Moriya interactions (DMI). In this paper, we study the magnetic properties of the rhombohedral MX$_{3}$ (M: V, Cr, Mn, and Fe. X: Cl, Br, and I) van der Waals materials with centrosymmetric lattice by combining first-principles calculations and Monte Carlo simulations. We found that the Dzyaloshinskii-Moriya vector acting between the second nearest neighbor sites of the intra-layer is non-zero and quite large even in MX$_{3}$ due to the breaking of the local inversion symmetry. We have found that the large DMI causes nano-scale magnetic vortexes, so-called skyrmions in MX$_{3}$. The diameter of skyrmions, e.g., in CrCl$_{3}$, is small, i.e., 2 nm, which is promising for the application of high-density magnetic memory devices. We have also found that not only conventional skyrmions in CrCl$_{3}$ and VCl$_{3}$ but also antiferromagnetic skyrmions in FeCl$_{3}$ and meron in MnCl$_{3}$ appear. Furthermore, we have found that the skyrmions in ClCl$_{3}$ and VCl$_{3}$ have a different helicity, which shows the possibility of controlling the helicity by electron/hole doping in MX$_{3}$ materials. Van der Waals materials, which have a great advantage of high degrees of freedom in structures such as heterostructures and twisted structures, exhibit high potential as skyrmion materials.
