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The helical Dirac fermions at the surface of topological insulators show astrong circular dichroism which has been explained as being due to either theinitial-state spin angular momentum, the initial-state orbital angularmomentum, or the handedness of the experimental setup. All of theseinterpretations conflict with our data from Bi2Te3 which depend on the photonenergy and show several sign changes. Our one-step photoemission calculationscoupled to ab initio theory confirm the sign change and assign the dichroism toa final-state effect. The spin polarization of the photoelectrons, instead,remains a reliable probe for the spin in the initial state.

Reversal of the circular dichroism in the angle-resolved photoemission from Bi2Te3