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

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. The spin polarization of the photoelectrons, instead, remains a reliable probe for the spin in the initial state.

preprint2013arXivOpen access
M. R. ScholzJ. Sánchez-BarrigaJ. BraunD. MarchenkoA. VarykhalovM. LindroosYung Jui WangHsin LinA. BansilJ. MinárH. EbertA. VolykhovL. V. YashinaO. Rader
cond-mat.mes-hallcond-mat.mtrl-sci
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Open access14 authors2 topics
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M. R. ScholzJ. Sánchez-BarrigaJ. BraunD. MarchenkoA. VarykhalovM. LindroosYung Jui WangHsin LinA. BansilJ. MinárH. EbertA. VolykhovL. V. YashinaO. Rader

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