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Spatial and Energy Distribution of Topological Edge States in Single Bi(111) Bilayer

2012; American Physical Society; Volume: 109; Issue: 1 Linguagem: Inglês

10.1103/physrevlett.109.016801

1092-0145

Fang Yang, Lin Miao, Zhengfei Wang, M. Yao, Fengfeng Zhu, Y. R. Song, Meixiao Wang, Jinpeng Xu, А. В. Федоров, Zhe Sun, G. B. Zhang, Canhua Liu, Feng Liu, Dong Qian, Chunlei Gao, Jinfeng Jia,

2D Materials and Applications

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.