1. Material Systems for Nanoelectronics; Technische Universität Chemnitz; 09107 Chemnitz Germany
2. Institute for Integrative Nanosciences; IFW Dresden; 01069 Dresden Germany
3. Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; 130022 Changchun China
4. Semiconductor Physics; Technische Universität Chemnitz; 09107 Chemnitz Germany
5. Changchun Institute of Optics; Fine Mechanics and Physics; Chinese Academy of Sciences; 130033 Changchun China
6. Center for Advancing Electronics Dresden; Dresden University of Technology; 01062 Dresden Germany