1. College of Physics
2. Jilin University
3. 130012 Changchun
4. P.R. China
5. Taras Shevchenko National University
6. 01601 Kyiv
7. Ukraine
8. STC “Institute for Single Crystals” NAS of Ukraine
9. 61001 Kharkiv
10. V. Lashkaryov Institute of Semiconductor Physics