Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 38: Spintronics
O 38.3: Vortrag
Dienstag, 8. März 2016, 14:30–14:45, S051
Spin-resolved ToF momentum-microscopy of anomalous surface states on W(110) — •D. Kutnyakhov1, S.V. Chernov1, R. Wallauer1, K. Medjanik2, S.A. Nepijko1, C. Tusche3, M. Ellguth3, S. Borek4, J. Braun4, J. Minár4,5, H. Ebert4, H.J. Elmers1, and G. Schönhense1 — 1Institut für Physik, Uni-Mainz — 2MAX IV Lab., Lund, Sweden — 3MPI für Mikrostrukturphysik, Halle — 4Dep. Chemie, LMU München — 5University of West Bohemia, Pilsen, Czech Republic
Spin-resolved bandmapping of anomalous surface states on W(110) has been performed via time-of-flight (ToF) momentum microscopy with an imaging spin-filter using synchrotron radiation at the beamline U125-NIM at BESSY II (hν=22 eV). 3D (kx,ky,EB)-maps in the full surface Brillouin zone with 3.4 Å−1 dia. and 4 eV binding energy range were measured simultaneously, resolving 2.5 × 105 voxels without and more than 104 voxels with spin resolution. Similar to our recent experiment on Mo(110) [1] the results give evidence for d-like surface resonances in the spin-orbit induced partial band gap. In agreement with previous results [2], we find the dispersing state with Dirac-like signature and Rashba spin texture crossing the bandgap at the Γ-point and EB=1.25 eV. A second linear band crossing occurs close to the midpoint between Γ and N at EB=0.8 eV. Results are compared with one-step photoemission calculations in its density matrix formulation.
Funded by BMBF (05K13UM1, 05K12EF1, 05K13WMA). [1] Chernov et al., Ultramicroscopy, (2015), doi:10.1016/j.ultramic.2015.07.008; [2] Miyamoto et al., PRL 108, 066808 (2012)