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We have performed high-resolution angle-resolved photoemission spectroscopyon TlBiSe2, which is a member of the ternary chalcogenides theoreticallyproposed as candidates for a new class of three-dimensional topologicalinsulators. By measuring the energy band dispersions over the entire surfaceBrillouin zone, we found a direct evidence for a non-trivial surface metallicstate showing a X-shaped energy dispersion within the bulk band gap. Thepresent result unambiguously establishes that TlBiSe2 is a strong topologicalinsulator with a single Dirac cone at the Brillouin-zone center. The observedbulk band gap of 0.4 eV is the largest among known topological insulators,making TlBiSe2 the most promising material for studying room-temperaturetopological phenomena.

Direct Evidence for the Dirac-Cone Topological Surface States in Ternary Chalcogenide TlBiSe2