Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 22: Joint Session "Topological Insulators II" (jointly with DS, HL, O, TT)

MA 22.2: Vortrag

Mittwoch, 28. März 2012, 09:45–10:00, EB 301

Probing the topological states of Sb2Te3 by spin polarized photoemission spectroscopy — •Christian Pauly1, Gustav Bihlmayer2, Marcus Liebmann1, Dinesh Subramaniam1, Martin Grob1, Alexander Georgi1, Markus Scholz3, Jaime Sanchez Barriga3, Stefan Blügel2, Oliver Rader3, and Markus Morgenstern11II. Physikalisches Institut B, RWTH Aachen University and JARA-FIT, Germany — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA-FIT, Germany — 3Helmholtz-Zentrum für Materialien und Energie, Berlin, Germany

Using high resolution spin- and angle-resolved photoemission spectroscopy, we map the electronic structure and spin texture of the surface states of the topological insulator Sb2Te3. Similar to the well explored Bi2Te3 and Bi2Se3 which possess TI properties with the most simple electronic structure [1], we directly show that Sb2Te3 exhibits Z2 topological properties with a single spin-Dirac cone at the Γ-point. In addition, a strongly spin-orbit split surface state is observed at lower energy. In Γ-K direction, the band is located within a spin-orbit gap, governing the energy position of the state. In combination with DFT calculation, we provide direct evidence for an argument given by Pendry [2], that there must be at least one surface state inside a SO gap, if the gap is located in the zone. Thus, similar to the topological state, this state is protected by symmetry. [1] H. Zhang et al., Nature Phys. 5, 438 (2009) [2] J. B. Pendry et al., Surf. Sci. 49, 87 (1975)

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