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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.34: Poster
Tuesday, March 27, 2012, 18:15–21:45, Poster B
Spin-orbit splitting in the valence bands of ZrSxSe2−x — •Mohamed Moustafa, Ali Ghafari, Christoph Janowitz, and Recardo Manzke — Institut für Physik, Humboldt Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany
Angle-resolved photoemission spectroscopy using synchrotron radiation was performed for ternary layered transition metal dichalcogenides ZrSxSe2−x, where x varies from 0 to 2. A characteristic splitting of the chalcogen p-derived valence bands along high symmetry directions was observed. The splitting size at the A point of the Brillouin zone is found to increase from 0.06 eV to 0.31 eV with increasing atomic number of the chalcogenide as progressing from ZrS2 towards ZrSe2, respectively. An almost linear behaviour of the splitting size upon the composition parameter x is observed. Our electronic structure calculations based on the density functional theory prove that this splitting is due to spin-orbit (SO) coupling. When considering spin-orbit coupling, the degeneracy of the valance bands is lifted.