Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Electronic Structure of Surfaces: Spectroscopy, Surface States I
O 79.9: Vortrag
Mittwoch, 22. März 2017, 17:15–17:30, WIL C307
Retrieving the initial-state spin polarization from spin-resolved photoemission: W(110) as a case study — •Jürgen Henk1, Koji Miyamoto2, Henry Wortelen2, and Markus Donath2 — 1Martin-Luther-Universität Halle-Wittenberg, Halle — 2Westfälische Wilhelms-Universität, Münster
Spin- and angle-resolved photoelectron spectroscopy (SARPES) aims at measuring the spin polarization of the initial states. In systems with sizable spin-orbit coupling, however, the photoemission process itself results in an additional spin polarization of the photoelectrons. This falsification can be considerable, even for surface states with spin-momentum locking.
We show that the initial-state spin polarization can be largely retrieved by combining SARPES data for selected setups. The idea is presented for optical orientation from the Dirac-type surface state of W(110). Theoretical spectra compare well with their experimental pendants; limitations of the approach are discussed.