Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.207602
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Funding
- Department of Energy [DE-FG02-08ER46521]
- Army Research Office (ARO-DURIP) [W911NF-09-1-0170]
- MRSEC of the National Science Foundation [DMR - 0819762]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819762] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-08ER46521] Funding Source: U.S. Department of Energy (DOE)
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A differential coupling of topological surface states to left-versus right-circularly polarized light is the basis of many optospintronics applications of topological insulators. Here we report direct evidence of circular dichroism from the surface states of Bi2Se3 using laser-based time-of-flight angle-resolved photoemission spectroscopy. By employing a novel sample rotational analysis, we resolve unusual modulations in the circular dichroism photoemission pattern as a function of both energy and momentum, which perfectly mimic the predicted but hitherto unobserved three-dimensional warped spin texture of the surface states. By developing a microscopic theory of photoemission from topological surface states, we show that this correlation is a natural consequence of spin-orbit coupling. These results suggest that our technique may be a powerful probe of the spin texture of spin-orbit coupled materials in general.
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