Logarithmic corrections in the one-dimensional Hubbard model with attraction

Autor:	N. M. Bogolyubov
Rok vydání:	1992
Předmět:	Statistics and Probability Physics Hubbard model Logarithm Applied Mathematics General Mathematics Quantum electrodynamics Lattice (order) External field Attraction Excitation
Zdroj:	Journal of Soviet Mathematics. 62:2955-2963
ISSN:	1573-8795 0090-4104
DOI:	10.1007/bf01097495
Popis:	The free energy in the vicinity of a half-filled band for the one-dimensional Hubbard model with attraction is calculated as a function of density (chemical potential). The expansion of the elementary excitation energies for a lattice of finite length N is accomplished with an accuracy of the order (N2 ln N)−1. An explicit expression for the free energy and the elementary excitation spectrum as functions of external field or of volume N is necessary for studying the asymptotic behavior of correlation functions.
Databáze:	OpenAIRE
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