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

Fang Yang, Lin Miao, Z. F. Wang, Meng-Yu Yao, Fengfeng Zhu, Y. R. Song, Mei-Xiao Wang, Jin-Peng Xu, Alexei V. Fedorov, Z. Sun, G. B. Zhang, Canhua Liu, Feng Liu, Dong Qian, C. L. Gao, and Jin-Feng Jia
Phys. Rev. Lett. 109, 016801 – Published 5 July 2012

Abstract

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 Bi2Te3 and Bi(111)-covered Bi2Te3 substrates. The edge states are localized in the vicinity of step edges having an 2nm 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.

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  • Received 26 February 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.016801

© 2012 American Physical Society

Authors & Affiliations

Fang Yang1, Lin Miao1, Z. F. Wang2, Meng-Yu Yao1, Fengfeng Zhu1, Y. R. Song1, Mei-Xiao Wang1, Jin-Peng Xu1, Alexei V. Fedorov3, Z. Sun4, G. B. Zhang4, Canhua Liu1, Feng Liu2,*, Dong Qian1,†, C. L. Gao1,‡, and Jin-Feng Jia1

  • 1Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education). Department of Physics, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, China
  • 2Department of Materials Science Engineering, University of Utah, Salt Lake City, Utah 84112, USA
  • 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94305, USA
  • 4National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, China

  • *Corresponding author. fliu@eng.utah.edu
  • Corresponding author. dqian@sjtu.edu.cn
  • Corresponding author. clgao@sjtu.edu.cn

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Issue

Vol. 109, Iss. 1 — 6 July 2012

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