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      Visualizing electronic structures of quantum materials by angle-resolved photoemission spectroscopy

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          Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface

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            Experimental realization of a three-dimensional topological insulator, Bi2Te3.

            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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              2D transition metal dichalcogenides

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                Author and article information

                Journal
                Nature Reviews Materials
                Nat Rev Mater
                Springer Science and Business Media LLC
                2058-8437
                September 2018
                August 29 2018
                September 2018
                : 3
                : 9
                : 341-353
                Article
                10.1038/s41578-018-0047-2
                ad4c1993-6434-4879-9fd6-3e20c9aeedfb
                © 2018

                http://www.springer.com/tdm

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