Affiliation: | 1. Solid State Division, Oak Ridge National Laboratory, USA;2. Department of Physics, The University of Tennessee, Knoxville, U.S.A.;2. Volgograd State Technical University, 400005 Volgograd, Russia;1. Center for Theoretical and Computational Physics and Department of Physics, Hue University''s College of Education, No. 34, Le Loi Str., Hue City, Viet Nam;2. The Vietnam Institute of Educational Sciences, No. 101, Tran Hung Dao Str., Hoan Kiem Dist., Hanoi, Viet Nam |