1. ITMO University; Kronverksky pr. 49 197101 St. Petersburg Russia
2. Nanotechnology Center, St. Petersburg Academic University; Khlopin st. 8/3 194021 St. Petersburg Russia
3. Saint-Petersburg State Electrotechnical University; Prof. Popova st. 5 197376 St. Petersburg Russia
4. Solid State Electronics Laboratory, TU Dresden; 01062 Dresden Germany