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Properties of the t‐J model in the dynamical mean field theory: One‐particle properties in the antiferromagnetic phase
Author(s) -
Obermeier Thomas,
Pruschke Thomas,
Keller Joachim
Publication year - 1996
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.2065080203
Subject(s) - physics , antiferromagnetism , mean field theory , degrees of freedom (physics and chemistry) , condensed matter physics , spin (aerodynamics) , particle (ecology) , field (mathematics) , limit (mathematics) , phase (matter) , quantum mechanics , thermodynamics , mathematical analysis , oceanography , mathematics , geology , pure mathematics
We study the one‐particle properties of the t‐J model within the framework of Vollhardt's dynamical mean field theory. By introducing an AB ‐sublattice structure we explicitly allow for a broken symmetry for the spin degrees of freedom and are thus able to calculate the one‐particle spectral function in the antiferromagnetic phase. We observe surprisingly rich structures in the one‐particle density of states for T < T N at finite doping up to 15%. These structures can be related to the well known results for one single hole in the Néel background. We are thus able to establish the relevance of this at a first sight academic limit to physical properties of the t‐J model with a finite density of holes in the thermodynamical limit.