Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.216801
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Funding
- Deutsche Forschungsgemeinschaft [EB-154/18, EB-154/23, SPP 1666]
- Bundesministerium fur Bildung und Forschung [05K10WMA]
- US Department of Energy, Office of Science, Basic Energy Sciences [DE-FG02-07ER46352]
- DOE [DE-AC02-05CH11231]
- Northeastern University's Advanced Scientific Computation Center (ASCC)
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The helical Dirac fermions at the surface of topological insulators show a strong circular dichroism which has been explained as being due to either the initial-state spin angular momentum, the initial-state orbital angular momentum, or the handedness of the experimental setup. All of these interpretations conflict with our data from Bi2Te3 which depend on the photon energy and show several sign changes. Our one-step photoemission calculations coupled to ab initio theory confirm the sign change and assign the dichroism to a final-state effect. Instead, the spin polarization of the photoelectrons excited with linearly polarized light remains a reliable probe for the spin in the initial state.
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