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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

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Spin-orbit splitting in the valence bands of ZrS_xSe_2−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 ZrS_xSe_2−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.