Ferromagnetism and Elementary Excitations in the Hubbard Model
M. Yu. Nikolaev, Natalia Ryzhanova, A. Vedyayev +1 more
Abstract Two pecularities of diagram technique for Hubbard operators are established. Fermi‐type excitations for the Hubbard model with strong Coulomb repulsion are investigated with the help of this technique. The cause of ferromagnetism in the Hubbard model is discovered. Bose‐type elementary excitations are investigated and the region of existence of ferromagnetic ground state is obtained.
physica status solidi (b)•Apr 1, 1985•17 citations