Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 22: Joint Session "Topological Insulators II" (jointly with DS, HL, O, TT)
MA 22.9: Talk
Wednesday, March 28, 2012, 11:45–12:00, EB 301
Origin of the strong circular dichroism of the topological surface state of Bi2Te3 — •Jaime Sánchez-Barriga1, M. R. Scholz1, D. Marchenko1, A. Varykhalov1, O. Rader1, A. Volykhov2, L. V. Yashina2, J. Braun3, J. Minár3, and H. Ebert3 — 1Helmholtz-Zentrum Berlin — 2Moscow State University — 3Ludwig-Maximilians-Universität München
We have recently reported a strong circular dichroism effect in angle-resolved photoemission of the spin polarized topological surface state of Bi2Te3 [1]. The effect has been observed recently also for Bi2Se3 and the origin is controversial [2-4]. An initial-state model has been employed to determine the spin orientation directly [3]. We present a series of photoemission measurements and density functional calculations coupled to one-step photoemission theory. Both experiment and theory reveal that the dichroism effect changes sign as a function of photon energy which excludes the initial-state model.
[1] M. R. Scholz, J. Sánchez-Barriga, D. Marchenko, A. Varykhalov, A. Volykhov, L. V. Yashina, O. Rader, submitted to Phys. Rev. Lett. (2010), arXiv:1108.1053
[2] S. R. Park et al., arXiv:1103.0805
[3] Y. H. Wang, D. Hsieh, D. Pilon, L. Fu, D. R. Gardner,Y. S. Lee, N. Gedik, arXiv:1101.5636
[4] Y. Ishida et al., Phys. Rev. Lett. 107, 077601 (2011)