Journal
SCIENCE
Volume 329, Issue 5993, Pages 821-824Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1189792
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Funding
- NSF under Materials Research Science and Engineering Centers [DMR-0819860]
- NSF [DMR-0084173]
- state of Florida
- U.S. Department of Energy
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [819860] Funding Source: National Science Foundation
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Topological insulators are insulating materials that display massless, Dirac-like surface states in which the electrons have only one spin degree of freedom on each surface. These states have been imaged by photoemission, but little information on their transport parameters, for example, mobility, is available. We report the observation of Shubnikov-de Haas oscillations arising from the surface states in nonmetallic crystals of Bi2Te3. In addition, we uncovered a Hall anomaly in weak fields, which enables the surface current to be seen directly. Both experiments yield a surface mobility (9000 to 10,000 centimeter(2) per volt-second) that is substantially higher than in the bulk. The Fermi velocity of 4 x 10(5) meters per second obtained from these transport experiments agrees with angle-resolved photoemission experiments.
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