▎ 摘　　要

Based on the tight-binding model, the electronic structure, free energy, and spin-dependent transport of graphene doped with Cr atoms are investigated. 'Geometric optimization' of the crystal structure of graphene with Cr admixture is accomplished by means of the free-energy minimization. As determined, the Cr atoms are adsorbed on the graphene surface. The origin of the spin-dependent electron transport of graphene with Cr atoms is revealed. As shown, the phenomenon of spin-dependent electron transport in graphene arises due to the strong electron correlations caused by the presence of Cr atoms. The value of the spin polarization of the electron transport is determined by both the difference of the partial densities of states for electrons with opposite spin projections at the Fermi level and the difference in relaxation times caused by different occupation numbers of single-electron states of carbon and chromium atoms. The value of the spin polarization of the electrical current increases with the concentration of Cr atoms.