Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 38: Spintronics

O 38.3: Talk

Tuesday, March 8, 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. Minár^4,5, 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 (k_x,k_y,E_B)-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 E_B=1.25 eV. A second linear band crossing occurs close to the midpoint between Γ and N at E_B=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)