Scanning Tunnelling Spectroscopic Studies of Dirac Fermions in Graphene and Topological InsulatorsN.-C. Yeh, M. L. Teague, R. T.-P. Wu, H. Chu, D. A. Boyd, M. W. Bockrath, L. He, F.-X. Xiu and K.-L. wangEPJ Web of Conferences, 23 (2012) 00021DOI: https://doi.org/10.1051/epjconf/20122300021