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O: Fachverband Oberflächenphysik

O 21: Electronic Structure and Spin-Orbit Interaction I

O 21.7: Talk

Monday, March 11, 2013, 17:30–17:45, H42

Spin texture and circular dichroism in photoelectron spectroscopy from the topological insulator Bi₂Te₃: First-principles photoemission calculations — •Hossein Mirhosseini¹ and Jürgen Henk² — ¹Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — ²Martin-Luther-Universität Halle-Wittenberg, Halle, Germany

By relativistic first-principles photoemission calculations for the topological insulator Bi₂Te₃, we study how the spin texture of the Dirac state manifests itself in circular dichroism [1]. On one hand, there are significant modifications of the initial state’s spin texture, which are explained by final-state effects and the symmetry of the photoemission set-up. On the other hand, a highly symmetric set-up allows to conclude on the detailed Dirac state’s spin texture. Our study supports that circular dichroism in angular distribution successfully complements spin- and angle-resolved photoelectron spectroscopy from topological insulators.

[1] H. Mirhosseini and J. Henk, Phys. Rev. Lett. 109 (2012) 036803.