Glide Mirror Plane Protected Nodal-Loop in an Anisotropic Half-Metallic MnNF Monolayer.,The Journal of Physical Chemistry Letters

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Glide Mirror Plane Protected Nodal-Loop in an Anisotropic Half-Metallic MnNF Monolayer.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-01-06 , DOI: 10.1021/acs.jpclett.9b03320
Yang Hu ₁ , Sheng-Shi Li ₁ , Wei-Xiao Ji ₁ , Chang-Wen Zhang ₁ , Meng Ding ₁ , Pei-Ji Wang ₁ , Shi-Shen Yan ₁

Affiliation

Two-dimensional (2D) nodal-loop (NL) semimetals have attracted tremendous attention for their abundant physics and potential device applications, whereas the realization of gapless NL semimetals robust against spin-orbit coupling (SOC) remains a big challenge. Recently, breakthroughs have been made with the realization of gapless NL semimetals in 2D half-metallic materials, where NLs were protected by a horizontal mirror plane symmetry. Here we first propose an alternative nonsymmorphic horizontal glide mirror plane symmetry which could protect the NLs in 2D materials. On the basis of comprehensive first-principles calculations and symmetry analysis, we found that the glide mirror symmetry together with intrinsic out-of-plane spin polarization can protect the NL against SOC in a half-metallic semimetal, namely, the MnNF monolayer. Moreover, we predict that the MnNF monolayer has strong anisotropic characteristics, tunable band structure by changing the magnetization direction, and 100% spin-polarized transport properties. Our work not only provides a novel 2D half-metallic semimetal with strong anisotropy but also broadens the scope of 2D nodal-loop materials.

中文翻译：

各向异性半金属MnNF单层中的滑行镜面保护的节点环。

二维（2D）节点环（NL）半金属因其丰富的物理特性和潜在的器件应用而引起了极大的关注，而对自旋轨道耦合（SOC）具有鲁棒性的无间隙NL半金属的实现仍然是一个巨大的挑战。最近，在二维半金属材料中实现无间隙NL半金属方面取得了突破，其中NL受水平镜面对称性保护。在这里，我们首先提出另一种非对称的水平滑行镜平面对称性，它可以保护2D材料中的NL。在全面的第一性原理计算和对称性分析的基础上，我们发现滑动镜的对称性和固有的平面外自旋极化可以保护NL免受半金属半金属（即MnNF单层）中的SOC侵害。而且，我们预测MnNF单层具有很强的各向异性特性，通过改变磁化方向具有可调谐的能带结构，并具有100％的自旋极化传输性质。我们的工作不仅提供具有强各向异性的新型2D半金属半金属，而且拓宽了2D节点环材料的范围。

更新日期：2020-01-06

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