Geodesic
Transformation of electron spectrum in the Hubbard model
Teoretičeskaâ i matematičeskaâ fizika, Tome 86 (1991) no. 2, pp. 262-271 
V. M. Zharkov. Transformation of electron spectrum in the Hubbard model. Teoretičeskaâ i matematičeskaâ fizika, Tome 86 (1991) no. 2, pp. 262-271. http://geodesic.mathdoc.fr/item/TMF_1991_86_2_a9/
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     author = {V. M. Zharkov},
     title = {Transformation of electron spectrum in the {Hubbard} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {262--271},
     year = {1991},
     volume = {86},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_86_2_a9/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A new functional representation for strongly correlated systems is used to study the evolution of the electron spectrum in the Hubbard model with increasing $U$. It is established that the parametric instability of the ground state of a strongly correlated metal with 1/4 filled band can be described by linear transformations of the dynamic fields. It is shown that the operator of the transformations has a nontrivial kernel. It is noted that the considered system can serve as a point of departure for interpreting structural transitions of $2k_F$ and $4k_F$ types in the quasione-dimensional metal MEM(TCNQ)$_2$.

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