Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Electronic Structure of Surfaces II

O 58.6: Vortrag

Mittwoch, 18. März 2015, 16:15–16:30, MA 041

Anomalous d-like Surface Resonance on Mo(110) Analyzed by Time-of-Flight Momentum Microscopy — •Sergey Chernov¹, Katerina Medjanik¹, Christian Tusche², Dmytro Kutnyakhov¹, Sergej Nepijko¹, Andreas Oelsner³, Jürgen Braun⁴, Jan Minár^4,5, Stephan Borek⁴, Hubert Ebert⁴, Hans Joachim Elmers¹, Jürgen Kirschner², and Gerd Schönhense¹ — ¹Johannes Gutenberg-Universität, D-55128 Mainz — ²Max Planck Institut für Mikrostrukturphysik, D-06120 Halle — ³Surface Concept GmbH, D-55124 Mainz — ⁴Ludwig-Maximilians-Universität, D-81377 München — ⁵University of West Bohemia, 306 14 Pilsen, Czech Republic

The d-like surface resonances on Mo(110) have been investigated by the novel technique of Time-of-Flight (ToF) momentum microscopy at BESSY (single-bunch). Regions of 3.4 Å⁻¹ dia. in k-space and 4 eV binding energy range were detected simultaneously. 3D (k_x,k_y,E_B) maps of the electronic bands in the full surface Brillouin zone were acquired with high efficiency. Photoemission calculations were performed by means of the one-step model in its density matrix formulation. Band symmetries were probed by linear dichroism. It will be shown that close to the midpoint between ¯ and N an anomalous band crosses the symmetry center of a band gap at E_B=0.8 eV. The anomalous band has linear dispersion in a very large energy range and shows much analogy to a similar state previously found on W(110) [Miyamoto et al., PRL 108, 066808 (2012)]. The project is funded by BMBF (05K12UM2, 05K12EF1, 05K13WMA) and COST.