Open AccessELECTRON CORRELATION EFFECT IN THE HUBBARD-HIRSCH MODEL
Author(s) -
Guozhu Wei
Publication year - 1994
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.43.1828
Subject(s) - hubbard model , electronic correlation , physics , condensed matter physics , ferromagnetism , correlation , phase diagram , strongly correlated material , electron , order (exchange) , phase (matter) , quantum mechanics , statistical physics , mathematics , superconductivity , finance , economics , geometry
Based on the single-site electron correlation, the local approach has been used to investigate the ferromagnetic phase in the Hubbard-Hirsch model. Using the R =0,α approximation in second-order calculation, the electron Correlation effect on the phase diagram has been studied Carefully. Comparing with those of the R=0 approximation, the electron correlation effect becomes weaker due to taking into aceount the nondiagonal elements of density matrix.