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Quasi‐particle peak due to magnetic order in strongly correlated electron systems
Author(s) -
Zaleski T.A.,
Kopeć T.K.
Publication year - 2010
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201000030
Subject(s) - physics , hubbard model , condensed matter physics , antiferromagnetism , electron , saddle point , boson , strongly correlated material , spin (aerodynamics) , coulomb , slave boson , fermion , quasiparticle , saddle , random phase approximation , quantum electrodynamics , quantum mechanics , superconductivity , mathematical optimization , geometry , mathematics , thermodynamics
We study the electron spectral function of the antiferromagnetically ordered phase of the three dimensional Hubbard model, using recently formulated low‐energy theory based on the 2D half‐filled Hubbard model which describes both collective spin and charge fluctuations for arbitrary value of the Coulomb repulsion U. The model then is solved by a saddle‐point approximation within the CP 1 representation for the Neel field. The single‐particle properties are obtained by writing the fermion field in terms of a U(1) phase, Schwinger boson SU(2) fields and a pseudofermion variables. We demonstrate that the appearance of a sharp peak in the electron spectral function in the antiferromagnetic state points to the emergence of the bosonic mode, which is associated with spin ordering.