Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 76: Electronic structure of surfaces: Spectroscopy, surface states II
O 76.6: Vortrag
Donnerstag, 12. März 2026, 11:45–12:00, HSZ/0201
Spin-resolved momentum microscopy of BiX2 surface alloys on Cu(111) and Ag(111) using a 2D imaging spin-filter — •Fabian Göhler, Stefanie Suzanne Brinkman, Xin Liang Tan, Anders Christian Mathisen, Chul-Hee Min, and Hendrik Bentmann — Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Despite the rapid development of angle-resolved photoelectron spectroscopy (ARPES), measurements of the electron spin over wide regions in momentum space remain challenging with single-channel spin detectors. In this contribution, we present spin-resolved ARPES measurements from a momentum microscope, which gives the photoelectron momentum distribution over the full half-sphere above the sample surface. When combined with a 2D imaging spin filter [1], this allows parallel measurement of the in-plane spin polarization for full constant energy cuts E(kx, ky). We acquired data on BiX2/X(111) surface alloys - formed by 1/3 monolayer of Bi atoms arranged in a (√3 × √3)R30∘ periodicity on Cu(111) or Ag(111) - which are well established model systems for spin-orbit effects and (spin-dependent) photoemission from surfaces [2-4]. Using linearly polarized (hν = 6.0 eV) and unpolarized (hν = 21.2 eV) light sources, we probe the spin polarization in these systems for varying experimental conditions.
[1] C. Tusche et al., Ultramicroscopy 159, 520 (2015)
[2] R. Noguchi et al., Phys. Rev. B 95, 041111 (2017)
[3] H. Bentmann et al., Phys. Rev. Lett. 119, 106401 (2017)
[4] A. Winkelmann et al., New J. Phys. 14, 083027 (2012)
Keywords: ARPES; Momentum Microscopy; Spin Polarisation; Surface States