Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.016801
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-FG02-07ER46383]
- University of Wisconsin-Madison
- NSF [DMR 13-05583]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1305583] Funding Source: National Science Foundation
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Circular dichroism (CD) observed by photoemission, being sensitive to the orbital and spin angular momenta of the electronic states, is a powerful probe of the nontrivial surface states of topological insulators, but the experimental results thus far have eluded a comprehensive description. We report a study of Bi2Te3 films with thicknesses ranging from one quintuple layer (two-dimensional limit) to 12 layers (bulk limit) over a wide range of incident photon energy. The data show complex variations in magnitude and sign reversals, which are nevertheless well described by a theoretical calculation including all three photoemission mechanisms: dipole transition, surface photoemission, and spin-orbit coupling. The results establish the nontrivial connection between the spin-orbit texture and CD.
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