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Electron correlations and transport effective mass in narrow‐band systems and the Hubbard model
Author(s) -
Arai Tadashi
Publication year - 1994
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560490514
Subject(s) - hubbard model , cuprate , t j model , physics , electronic correlation , fermion , condensed matter physics , electronic band structure , electron , strongly correlated material , statistical physics , quantum mechanics , superconductivity
The Hubbard model is rederived from a tight‐binding band calculation, showing that, as long as parameters are properly chosen, the model is justified for calculating electronic properties of narrow‐band systems. The treatment is extended by including correlations and it was found that bound solutions called dimers exist. The concept of dimers is found to be very powerful for understanding the unusual properties of heavy fermion systems. However, a Mott‐Hubbard‐like model may be required to calculate properties of high T c cuprates. © 1994 John Wiley & Sons, Inc.