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Ferromagnetism and Elementary Excitations in the Hubbard Model
Author(s) -
Nikolaev M. Yu.,
Ryzhanova N. V.,
Vedyaev A. V.,
Zubritskii S. M.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280217
Subject(s) - hubbard model , ferromagnetism , physics , condensed matter physics , ground state , type (biology) , coulomb , fermi gamma ray space telescope , t j model , quantum mechanics , superconductivity , geology , electron , paleontology
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.