Snapshots of Dirac fermions near the Dirac point in topological insulators

Chih-Wei Luo^*, H. J. Wang, S. A. Ku, H. J. Chen, T. T. Yeh, Jiunn-Yuan Lin, Kaung-Hsiung Wu, Jenh-Yih Juang, Ben-Li Young, Takayoshi Kobayashi, C. M. Cheng, C. H. Chen, K. D. Tsuei, R. Sankar, F. C. Chou, K. A. Kokh, O. E. Tereshchenko, E. V. Chulkov, Yu M. Andreev, G. D. Gu