论文标题
合成的AG3C20单层中的机械各向异性和多个方向依赖的狄拉克状态
Mechanical Anisotropy and Multiple Direction-Dependent Dirac States in the Synthesized Ag3C20 Monolayer
论文作者
论文摘要
最近，通过组装与多个芳基金属键相关的有机分子，合成了一个2D原骨抗物框架AG3C20单层。在本文中，通过第一原理研究，我们证明了由于独特的键合特征，AG3C20单层不仅表现出强大的机械各向异性，而且还具有各种可调方向依赖性的DIRAC状态。在费米级的吹动周围，固有的狄拉克点形成了受镜子对称性保护的两个反平行的准型III结节线，它们可以进一步演变为微小菌株下的混合节点环。有趣的是，在上面的费米水平附近，可以通过合并两个I型Dirac锥体在临界菌株下出现特殊的半迪拉克状态，该圆锥体具有方向依赖性的强度局部固定的费米，正常的大规模携带和超快的dirac fermions。这些发现表明，机械敏感的AG3C20单层是一种有前途的2D材料，可以实现有趣的狄拉克物理学和高度各向异性的多重携带。
Recently, a 2D orthorhombic silver-organic framework, Ag3C20 monolayer, was synthesized by assembling organic molecules linked with multiple aryl-metal bonds. Herein, via first-principles study, we demonstrate that owing to the unique bonding feature, Ag3C20 monolayer not only exhibits strong mechanical anisotropy, but also possesses various tunable direction-dependent Dirac states. Around the Fermi level blow, the intrinsic Dirac points form two antiparallel quasi type-III nodal lines protected by mirror symmetry, which can further evolve into hybrid nodal loops under tiny strains. Intriguingly, near the Fermi level above, a special semi-Dirac state can emerge under a critical strain by merging two type-I Dirac cone, which harbors direction-dependent strongly localized fermions, normal massive carries, and ultrafast Dirac fermions at the same time. These findings suggest that the mechanically sensitive Ag3C20 monolayer is a promising 2D material to realize the interesting Dirac physics and highly anisotropic multiple carries transport.
