Manipulation of Spin Polarization in Boron-Substituted Graphene Nanoribbons
Manipulation of Spin Polarization in Boron-Substituted Graphene Nanoribbons
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DOI：
10.1021/acsnano.2c04563
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发表时间：
2022-06-22
期刊：
影响因子：
17.1
通讯作者：
Kawai, Shigeki
中科院分区：
文献类型：
--
作者：
Sun, Kewei;Silveira, Orlando J.;Kawai, Shigeki
扩展π碳系统中自旋极化引起的磁拓扑态的设计在自旋电子学中具有很大的应用潜力。虽然石墨烯纳米带（GNR）中的磁性锯齿形边缘已经被研究过了，但在杂原子取代的系统中对自旋极化的实空间观察和操纵仍然具有挑战性。本文利用低温扫描隧道显微镜/光谱学和密度泛函理论计算相结合的方法，研究了AuSiX/Au（111）表面扶手椅型GNR中心硼位的零偏压峰.在针尖诱导去除与相邻两个硼原子相连的Si原子后，出现了清晰的近藤共振峰，并被12 T的外加磁场进一步分裂。这种磁状态可以通过连续去除Si原子而沿着GNR的纵轴传递。
The design of magnetic topological states due to spin polarization in an extended pi carbon system has great potential in spintronics application. Although magnetic zigzag edges in graphene nanoribbons (GNRs) have been investigated earlier, real-space observation and manipulation of spin polarization in a heteroatom substituted system remains challenging. Here, we investigate a zero-bias peak at a boron site embedded at the center of an armchair-type GNR on a AuSiX/Au(111) surface with a combination of low-temperature scanning tunneling microscopy/spectroscopy and density functional theory calculations. After the tip-induced removal of a Si atom connected to two adjacent boron atoms, a clear Kondo resonance peak appeared and was further split by an applied magnetic field of 12 T. This magnetic state can be relayed along the longitudinal axis of the GNR by sequential removal of Si atoms.