1. Institute for Integrative Nanosciences, IFW Dresden,
Helmholtzstraße 20, D-01069 Dresden, Germany
2. Laboratory of Mathematical Physics, Tomsk Polytechnic University, Lenin Ave. 30, 634050
Tomsk, Russia
3. Material Systems
for Nanoelectronics, Chemnitz University of Technology, Reichenhainer Straße 70, D-09107 Chemnitz, Germany