Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 73: Electronic Structure of Surfaces 1
O 73.2: Talk
Thursday, September 8, 2022, 15:15–15:30, S053
Rashba-split surface state and spin-dependent photon emission from Re(0001) at Γ — •Sven Schemmelmann1, Fabian Schöttke1, Peter Krüger2, and Markus Donath1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität, Münster — 2Institut für Ferstkörpertheorie, Westfälische Wilhelms-Universität, Münster
The unoccupied electronic structure of the Re(0001) surface around the center of the surface Brillouin zone was investigated by spin- and angle-resolved inverse photoemission [1]. The detected states were studied with respect to intrinsic and extrinsic spin-polarization effects. A surface state with Rashba-type spin splitting is detected close to the Fermi level, that disperses downward below the Fermi energy. Furthermore, for normal electron incidence, we observed spin-dependent photon emission from unpolarized bulk and surface states. The sign of the observed spin asymmetry varies for different states and depends on experimental parameters such as electron spin-polarization direction and photon-detection angle. Maximum spin asymmetry is observed if the electron spin polarization and the plane of photon emission are perpendicular. The asymmetry is zero if both are parallel [2]. The effect is traced back to the spin-orbit-induced hybridization of the involved states.
[1] S. Schemmelmann et al., Physical Review B 104, 205425 (2021)
[2] E. Tamura and R. Feder, Solid State Commun. 79, 989 (1991)