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CHEN, Y. L; ANALYTIS, J. G; ZHANG, S. C; FISHER, I. R; HUSSAIN, Z; SHEN, Z.-X; CHU, J.-H; LIU, Z. K; MO, S.-K; QI, X. L; ZHANG, H. J; LU, D. H; DAI, X; FANG, Z
Science (American Association for the Advancement of Science), 07/2009, Letnik: 325, Številka: 5937Journal Article
Three-dimensional topological insulators are a new state of quantum matter with a bulk gap and odd number of relativistic Dirac fermions on the surface. By investigating the surface state of Bi2Te3 with angle-resolved photoemission spectroscopy, we demonstrate that the surface state consists of a single nondegenerate Dirac cone. Furthermore, with appropriate hole doping, the Fermi level can be tuned to intersect only the surface states, indicating a full energy gap for the bulk states. Our results establish that Bi2Te3 is a simple model system for the three-dimensional topological insulator with a single Dirac cone on the surface. The large bulk gap of Bi2Te3 also points to promising potential for high-temperature spintronics applications.
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