D.A. Usanov - Dr. Sc. (Phys.-Math.), Professor, Department of Solid-State Physics, Saratov State University named after N.G. Chernyshevsky, Honored Scientist of RF. E-mail: usanovda@info.sgu.ru A.V. Skripal - Dr. Sc. (Phys.-Math.), Professor, Department of Solid-State Physics, Saratov State University named after N.G. Chernyshevsky. E-mail: skripala_v@info.sgu.ru M.K. Merdanov - Ph. D. (Eng.), General Director of JCS «SPC «Electronic engineering» (Moscow). E-mail: merdanov@rambler.ru S.G. Evteev - Post-graduate Student, Department of Solid-State Physics, Saratov State University named after N.G. Chernyshevsky. E-mail: cepr_321@mail.ru