论文标题
来自二元，三元和第四纪化合物的多胎费物的对称性保护和巨型费米弧
Symmetry protection and giant Fermi arcs from multifold fermions in binary, ternary, and quaternary compounds
论文作者
论文摘要
最近在晶体系统中报道了较高的手性费米子超出了两倍的韦尔葬礼。在这里，我们将重点放在与Coge，Bisbpt和Kmgbo3的几种二元，三元和四元合金/化合物中，作为属于Crystal Space群（SG）198的代表性示例。我们发现了在大体密度中的大量通过密度计算中的分子中的三，四，四倍和六倍的鼠标。我们为保护这些变性性提供了普遍的对称性论点，并特别强调了四倍的费米子。我们的表面光谱模拟表明，由于几乎没有琐碎的散装费米口袋，这些手性费米子引起的费米弧的大小较大，坚固且未受到散装状态。所有这些功能使这些系统（尤其是Coge和KMGBO3）有希望的拓扑半学候选者，以实现未来的光发射和运输实验中的更高折叠的费用。
Higher-fold chiral fermions that go beyond two-fold Weyl fermions have recently been reported in crystalline systems. Here, we focus on such excitations in several binary, ternary and quaternary alloys/compounds with CoGe, BiSbPt and KMgBO3 as the representative examples that belong to the crystal space group (SG) 198. We found distinct three-fold, four-fold and six-fold chiral fermions in the bulk via Density Functional computations. We provide general symmetry arguments for the protection of these degeneracies with special emphasis on the four-fold fermions. Our surface spectra simulations show that the size of Fermi arcs resulting from these chiral fermions are large, robust and untouched from the bulk states due to the near absence of trivial bulk Fermi pockets. All these features make these systems -- especially CoGe and KMgBO3 -- promising topological semimetal candidates to realize higher-fold fermions in future photo-emission and transport experiments.
