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 Minár^2,6, 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.