Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 79: Electronic Structure of Surfaces: Spectroscopy, Surface States I

O 79.4: Vortrag

Mittwoch, 22. März 2017, 16:00–16:15, WIL C307

Spin-dependence in photoemission from strongly spin-orbit coupled systems — •Henriette Maaß1, Hendrik Bentmann1, Eugene E. Krasovskii2,3,4, Thiago R. F. Peixoto1, Christoph Seibel1, and Friedrich Reinert11Experimentelle Physik VII, Universität Würzburg, D-97074 Würzburg — 2Departamento de Física de Materiales, Universidad del Pais Vasco UPV/EHU, 20080 San Sebastían/Donostia, Spain — 3Donostia International Physics Center (DIPC), 20018 San Sebastían/Donostia, Spain — 4IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain

Strong spin-orbit coupling governs the emergence of electronic states with an intrinsic spin polarization. Prominent examples are topological surface states which form for example on the surface of Bi2Te3, or Rashba-type spin-splittings in noble metals and surface alloys. Using spin- and angle resolved photoelectron spectroscopy we have investigated the spin- and orbital texture of the topological insulators Bi2Te3 and Bi2Te2Se as well as the surface alloy BiAg2. Interestingly, whereas at first sight the measured photoelectron spin polarization strongly resembles the one expected for the ground state, strong modulations occur in both, the topological surface states as well as Rashba-type surface states, when the light polarization or photon energy is changed. These modulations reflect a strong influence of the symmetry of initial and final state as well as the experimental alignment on the measured photoelectron spin polarization. Our data yields insight into the relation between the result of a spin-sensitive photoemission experiment and the intrinsic spin-structure of material.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2017 > Dresden