Journal
SCIENCE
Volume 325, Issue 5937, Pages 178-181Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1173034
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Funding
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- NSF of China
- National Basic Research Program of China
- International Science and Technology Cooperation Program of China
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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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