Affiliation: | (1) Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria;(2) Institute of Nanostructured Materials and Photonics, JOANNEUM RESEARCH Forschungsgesellschaft mbH, Weiz, Austria;(3) Institute of Experimental Physics, Johannes Kepler University, Linz, Austria |