ACKNOWLEDGMENTS This work was supported by the Doctoral Discipline Foundation of the Ministry of Education of China (No.20070533118) and the National Natural Science Foundation of China (No.50871124). The authors acknowledge Dr. Y. Z. Nie for his useful discussion in calculations.
The difference of energy and electronic structure of V, Nb, and Ta in different crystalline structures were investigated by different methods in density functional theory (DFT). Lattice constants, total energies, an...