Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Posters: Scanning Probe Methods
O 63.32: Poster
Mittwoch, 2. April 2014, 17:30–21:00, P2
Spin-resolved core-level photoemission spectroscopy of W and TaS2 — •Tim Haase, Arndt Quer, Erik Kröger, Lars Oloff, Matthias Kalläne, Lutz Kipp, and Kai Rossnagel — Institute of Experimental and Applied Physics, University of Kiel, 24098 Kiel, Germany
Electron spin polarization shows up in a number of effects at solid surfaces, most prominently via the spin-momentum locking in Rashba systems and topological insulators, but also of course via the exchange splitting in itinerant ferromagnets. All these effects may be used to validate spin detection schemes in photoemission spectroscopy. Here, however, to characterize a commercial 3D Mott detector, we have used an effect first described by Cherepkov [1,2], i.e., the spin specific photoemission from the core levels of nonmagnetic materials due to excitation with circularly polarized light. Employing the variable polarization soft X-ray beamline P04 of PETRA III (DESY), we have performed electron-spin- and photon-polarization-dependent 4f core-level photoemission spectroscopy of W and TaS2. The results are interpreted in the context of free atom theory and possible deviations from the theory are discussed. The results are finally used to determine the Sherman function of the detector.
[1] N. A. Cherepkov, Phys. Lett. 40A, 119 (1972).
[2] N. A. Cherepkov, Soviet Physics JETP 38, 463 (1974).