1. Institute of Experimental Physics, TU Bergakademie Freiberg, Leipziger Str. 23, 09599 Freiberg, Germany
2. NaMLab gGmbH, Nöthnitzer Str. 64, 01187 Dresden, Germany
3. Institute for Semiconductors and Microsystems, TU Dresden, Nöthnitzer Str. 64, 01187 Dresden, Germany