Spatial and energy distribution of topological edge states in single Bi(111) bilayer.
Spatial and energy distribution of topological edge states in single Bi(111) bilayer.
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DOI：
10.1103/physrevlett.109.016801
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发表时间：
2012-06
影响因子：
8.6
通讯作者：
Fang Yang;L. Miao;Z. F. Wang;M. Yao;F. Zhu;Y. R. Song;Mei-Xiao Wang;Jinpeng Xu;A. Fedorov-A.-Fedo
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文献类型：
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作者：
Fang Yang;L. Miao;Z. F. Wang;M. Yao;F. Zhu;Y. R. Song;Mei-Xiao Wang;Jinpeng Xu;A. Fedorov-A.-Fedo
通过扫描隧道显微镜与光谱学、角分辨光谱学和密度泛函理论波段计算相结合，我们直接观察并解析了干净的Bi(2)Te(3)和Bi（111）覆盖的Bi(2)Te(3)衬底上单层Bi（111）岛的一维边缘态。这些边缘态分布在实际空间中宽约2 nm的阶边附近，并且存在于Bi(111) BL的能隙中。我们的结果证明了单个Bi（111）双分子层作为二维拓扑绝缘体存在非平凡拓扑边缘态。
By combining scanning tunneling microscopy and spectroscopy, angle-resolved photoemission spectroscopy, and density functional theory band calculations, we directly observe and resolve the one-dimensional edge states of single bilayer (BL) Bi(111) islands on clean Bi(2)Te(3) and Bi(111)-covered Bi(2)Te(3) substrates. The edge states are localized in the vicinity of step edges having an ∼2 nm wide spatial distribution in real space and reside in the energy gap of the Bi(111) BL. Our results demonstrate the existence of nontrivial topological edge states of single Bi(111) bilayer as a two-dimensional topological insulator.