Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 73: Electronic Structure of Surfaces 1
O 73.1: Vortrag
Donnerstag, 8. September 2022, 15:00–15:15, S053
Rashba-split image-potential state at Re(0001) — •Fabian Schöttke, Sven Schemmelmann, Peter Krüger, and Markus Donath — Westfälische-Wilhelms-Universität Münster, Germany
Since image states are located mainly in the vacuum in front of the surface, the influence of spin-dependent interactions on these states is a topic of ongoing debate in the literature. In particular, calculations predict Rashba-type spin splittings for image states [1], but experimental results of small spin splittings are controversial [2,3]. In addition, these two-photon-photoemission results using circular dichroism provide only indirect information about the spin polarization of states.
We measured the unoccupied surface electronic structure of Re(0001) with spin- and angle-resolved inverse photoemission. This method allows to investigate the spin orientations directly. We identified the n=1 image state at a binding energy of EV−E=0.68±0.04 eV and with an effective mass of m*/me=1.2±0.1. Careful spin-resolved measurements for several angles of electron incidence allowed us to detect Rashba-type spin-dependent energy splittings of this state with a Rashba parameter of αR=105±33 meV Å [4].
[1] McLaughlan et al., J. Phys.: Condens. Matter 16, 6841 (2004).
[2] Tognolini et al., Phys. Rev. Lett. 115, 046801 (2015).
[3] Nakazawa et al., Phys. Rev. B 94, 115412 (2016).
[4] Schöttke et al., Phys. Rev. B 105, 155419 (2022).