Abstract

Drumheadlike surface states are typical characteristics in nodal line semimetals and bring varieties of unusual attractive properties. Here we demonstrate the double drumheadlike surface states in group V elemental semimetals As, Sb, Bi, which family materials behave a nodal line topology with a 3D flowerlike nodal line, using first-principles calculations. On (001) surface of group V elemental semimetals, the projection pattern of the nodal line overlaps and a complicated double drumheadlike surface state appears inside the overlapped region. This double surface state is widely distributed on the surface region up to a penetration depth of 3.5 nm, which is much deeper than the depth of single surface state on (111) surface. Given that the simplicity of the elemental structure and the small gap induced by the spin orbit coupling, this family materials are promising candidates for the experimental observation of the novel double drumheadlike surface state.

中文翻译：

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V族节点线半金属中的双鼓面状表面态

摘要

鼓头状表面状态是节点线半金属的典型特征，并带来了各种不同寻常的吸引力。在这里，我们使用第一原理计算，证明了V组元素半金属As，Sb，Bi中的双鼓面状表面状态，这些族材料表现出具有3D花状节点线的节点线拓扑。在V组元素半金属的（001）表面上，节线的投影图案重叠，并且在重叠区域内出现复杂的双鼓面状表面状态。该双表面状态在表面区域上广泛分布，直到3.5 nm的穿透深度，比（111）表面上的单表面状态的深度深得多。考虑到元素结构的简单性和自旋轨道耦合引起的小间隙，