论文标题
耦合碳链中的结构变形和金属 - 气门导体过渡
Structural Deformation and Metal-Semiconductor Transition in Coupled Carbon Chains
论文作者
论文摘要
在材料中，间隙（半导体）和无间隙（金属）阶段的过渡与带隙的可调性之间的过渡是新时代设备制备的非常有利可图但又具有挑战性的目标。对于散装材料和二维分层系统，这是一个快速扩展的领域。从理论上讲，我们提出了具有可调带盖的一维纯碳材料。我们发现，与单个半导体链不同，两个平行耦合的多扬链链在费米水平上横流带显示金属行为。在横向和纵向应变下，淋巴结点（两个）的数量（两个）是稳健的，表明金属相受对称性保护的性质。相对于另一个断裂反射对称性和一个清晰的带隙在节点上打开，从而导致相位的相位，从而导致相位的相位，从而使一个链滑动。通过改变幻灯片参数，可以有效地调整频带隙。这项工作启动并指示了实际一维材料的可能拓扑阶段，而无需涉及边缘模式。
The transition between gapped (semiconducting) and gapless (metallic) phases and tunability of bandgap in materials is a very lucrative yet considerably challenging goal for new-age device preparation. For bulk materials and for two-dimensional layered systems, this is a rapidly expanding field. We theoretically propose a one-dimensional pure carbon material with a tunable bandgap. We find that two parallel coupled polyyne chains show metallic behaviour with bands crossing on the Fermi level, unlike the single semiconducting chain. The number of nodal points (two) is robust under transverse and longitudinal strain, indicating the symmetry-protected nature of the metallic phase. Sliding one chain with respect to the other breaks reflection symmetry and a clear bandgap opens up at the nodes, leading to a gapped phase. By varying the slide parameter, the bandgap can be tuned efficiently. This work initiates and indicates possible topological phases of real one-dimensional materials without the involvement of edge modes.
