Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Topological Insulators I (jointly with DS, HL, O, TT)
MA 43.2: Vortrag
Mittwoch, 22. März 2017, 15:15–15:30, HSZ 401
Unraveling the Spin Structure of Unoccupied States in Bi2Se3 — •Christian Langenkämper1, Anna Zumbülte1, Jürgen Braun2, Tobias Förster3, Anke B. Schmidt1, Jianli Mi4, Bo Iversen4, Philip Hofmann5, Jan Minár2,6, Hubert Ebert2, Peter Krüger3, Michael Rohlfing3, and Markus Donath1 — 1Physikalisches Institut, WWU Münster, Germany — 2Department of Chemistry, LMU München, Germany — 3Institut für Festkörpertheorie, WWU Münster, Germany — 4Center for Materials Crystallography, Department of Chemistry, Aarhus University, Denmark — 5Department of Physics and Astronnomy, Interdisciplinary Nanoscience Center, Aarhus University, Denmark — 6New Technologies Research Centre, University of West Bohemia Pilzen, Czech Republic
The control of spin currents in topological insulators using optical transitions opens new perspectives in (opto-)spintronics. To understand these processes involving topological surface states, a profound knowledge about the dispersion and the spin polarization of both the occupied and the unoccupied electronic states is crucial. We present a joint experimental and theoretical study on the unoccupied electronic states of Bi2Se3. We discuss spin- and angle-resolved inverse photoemission results in comparison with calculations for both the intrinsic band structure and, within the one-step model of (inverse) photoemission, the expected spectral intensities. This allows us to unravel the intrinsic spin texture of the unoccupied bands at the surface of Bi2Se3.