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Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 51: Topological Insulators (joint session DS, HL, MA, O, TT, organized by MA)

TT 51.2: Talk

Wednesday, March 22, 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 Donath11Physikalisches 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.

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