论文标题
石墨烯纳米纤维中硼替代引起的拓扑边界状态的磁性
Magnetism of topological boundary states induced by boron substitution in graphene nanoribbons
论文作者
论文摘要
基于碳基电子的低维平台的石墨烯纳米纤维（GNRS）表明，有前途的视角也将自旋极化结合到其共轭电子系统中。但是，GNR中的磁性通常与锯齿形边缘周围的局部状态有关，难以捏造并且反应性高。在这里，我们证明磁力也可以通过其内部的原子精确的工程拓扑缺陷从物理GNR曲折边缘引起。插入碳主链中的一对替代硼原子打破了其拓扑带的结合，并在周围建立了两个自旋极化边界状态。通过在扫描隧道显微镜的尖端和样品之间悬浮的硼取代的GNR在电运输测量中检测到自旋态。第一原则模拟发现硼对诱导自旋1，通过对对之间的间距进行调整来修改。我们的结果证明了将旋转链嵌入GNR中的途径，将它们转换为Spintronic设备的基本元素。
Graphene nanoribbons (GNRs), low-dimensional platforms for carbon-based electronics, show the promising perspective to also incorporate spin polarization in their conjugated electron system. However, magnetism in GNRs is generally associated to localized states around zigzag edges, difficult to fabricate and with high reactivity. Here we demonstrate that magnetism can also be induced away from physical GNR zigzag edges through atomically precise engineering topological defects in its interior. A pair of substitutional boron atoms inserted in the carbon backbone breaks the conjugation of their topological bands and builds two spin-polarized boundary states around. The spin state was detected in electrical transport measurements through boron-substituted GNRs suspended between tip and sample of a scanning tunneling microscope. First-principle simulations find that boron pairs induce a spin 1, which is modified by tuning the spacing between pairs. Our results demonstrate a route to embed spin chains in GNRs, turning them basic elements of spintronic devices.
