Graphene edges; localized edge state and electron wave interference
Graphene edges; localized edge state and electron wave interference
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DOI：
10.1051/epjconf/20122300017
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Enoki
中科院分区：
文献类型：
--
作者：
T. Enoki
石墨烯六方二分体中的无质量狄拉克费米子的电子结构被边缘的存在严重地改变，这取决于边缘手性。在锯齿形边缘，由于赝自旋对称性破缺，产生了强自旋极化的非键边缘态。在扶手椅边缘的散射中，K-K'谷间跃迁引起电子波干涉。在超高真空STM/STS观测中观察到锯齿形边缘的边缘态。在拉曼G波段观察到扶手椅边缘的电子波干涉现象，在STM图像中观察到蜂窝状超晶格图案及其精细结构。
The electronic structure of massless Dirac fermion in the graphene hexagonal bipartite is seriously modified by the presence of edges depending on the edge chirality. In the zigzag edge, strongly spin polarized nonbonding edge state is created as a consequence of broken symmetry of pseudo-spin. In the scattering at armchair edges, the K-K' intervalley transition gives rise to electron wave interference. The presence of edge state in zigzag edges is observed in ultra-high vacuum STM/STS observations. The electron wave interference phenomenon in the armchair edge is observed in the Raman G-band and the honeycomb superlattice pattern with its fine structure in STM images.