论文标题
孔掺杂引起的分层CDOHCL中的半金属铁磁性
Half-metallic ferromagnetism in layered CdOHCl induced by hole doping
论文作者
论文摘要
下一代的自旋设备将受益于低维度，铁磁学和半金属性，可能由电场控制。我们发现这些具有技术吸引力的特征将与掺杂的CDEHCL中的磁性磁性的外来显微镜起源（范德华）材料相结合，可以从中剥落2D层。通过第一原则模拟，我们预测在大容量和单层中都会引起$ p $ band的磁性，并在斯托纳不稳定方面解释我们的发现：由于费米水平是通过nestive $ per of fermagnetism $ 1 $ 1 $ 1通过奇异性来调整的，因此，FERMI级别通过销售量来调整，fermagnetism $ per of Fermagnetist $ per of Fermagnetist $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1 $ 1对于10 $^{14} $ cm $^{ - 2} $的层载体密度的半金属行为。此外，我们将静电掺杂作为诱导CDOHCL的单层和双层的磁性的附加手柄。在垂直于原子薄膜的关键电场应用（分别低至0.2 v/$ a $ $和0.5 v/$ a $ a°$），分别在双层和单层案例中），我们设想出现磁性半金属状态的出现。单层与双层系统的不同行为，以及对双层中正和负电场的不对称响应，以CDOHCL原子堆栈的内在极性来解释，这是材料的独特特征。从角度来看，鉴于CDOHCL双层中临界场的实验可访问幅度，可以设想$ p $ band磁力将在微型的Spintronic设备中利用。
Next-generation spintronic devices will benefit from low-dimensionality, ferromagnetism, and half-metallicity, possibly controlled by electric fields. We find these technologically-appealing features to be combined with an exotic microscopic origin of magnetism in doped CdOHCl, a van der Waals material from which 2D layers may be exfoliated. By means of first principles simulations, we predict homogeneous hole-doping to give rise to $p$-band magnetism in both the bulk and monolayer phases and interpret our findings in terms of Stoner instability: as the Fermi level is tuned via hole-doping through singularities in the 2D-like density of states, ferromagnetism develops with large saturation magnetization of 1 $μ_B$ per hole, leading to a half-metallic behaviour for layer carrier densities of the order of 10$^{14}$ cm$^{-2}$. Furthermore, we put forward electrostatic doping as an additional handle to induce magnetism in monolayers and bilayers of CdOHCl. Upon application of critical electric fields perpendicular to atomically-thin-films (as low as 0.2 V/$A°$ and 0.5 V/$A°$ in the bilayer and monolayer case, respectively), we envisage the emergence of a magnetic half-metallic state. The different behaviour of monolayer vs bilayer systems, as well as an observed asymmetric response to positive and negative electric fields in bilayers, are interpreted in terms of intrinsic polarity of CdOHCl atomic stacks, a distinctive feature of the material. In perspective, given the experimentally accessible magnitude of critical fields in bilayer of CdOHCl, one can envisage $p$ band magnetism to be exploited in miniaturized spintronic devices.
