Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Electronic structure of surfaces: Spectroscopy, surface states II

O 57.8: Vortrag

Mittwoch, 14. März 2018, 12:30–12:45, MA 042

Fermi Surface, Fermi-Velocity and Circular Dichroism of Rhenium Measured with Soft X-Rays — •Katerina Medjanik¹, Dmitry Vasilyev¹, Sergey Babenkov¹, Martin Ellguth¹, Benedikt Schönhense², Jens Viefhaus³, Hans-Joachim Elmers¹, and Gerd Schönhense¹ — ¹JGU, Inst. für Physik, Mainz — ²Imperial College London, UK — ³DESY Photon Science, Hamburg

Parallel-imaging k-space microscopy with time-of-flight energy recording has substantially advanced photoemission data recording. In combination with the circularly-polarized high-brilliance soft X-rays at beamline P04 at PETRA III (Hamburg), we acquired 4D photoemission data arrays I(E_B,k_x,k_y,k_z) for both photon helicities in the full bulk Brillouin zone and energy range of the d-band complex. Here, we present the experimental Fermi surface map for rhenium (hcp), revealing unprecedented detail quality. The full data set, including Fermi-velocity distribution v_F(k) and circular dichroism texture have been obtained in a few hours of acquisition time. Maximum k_z-resolution has been achieved by variation of the photon energy in small steps. Data are compared with our previous results for tungsten (bcc) [1] and iridium (fcc) [2].

[1] K. Medjanik et al., Nat. Materials 16, 615 (2017); [2] G. Schönhense et al., Ultramicr. 183, 19 (2017).