Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-03-11
Physics
Condensed Matter
Strongly Correlated Electrons
15 pages, 11 figures
Scientific paper
One-dimensional systems have unusual properties such as fractionalization of degrees of freedom. Possible extensions to higher dimensional systems have been considered in the literature. In this work we construct a mean field theory of the Hubbard model taking into account a separation of the degrees of freedom inspired by the one-dimensional case and study the finite-temperature phase diagram for the Hubbard chain and square lattice. The mean field variables are defined along the links of the underlying lattice. We obtain the spectral function and identify the regions of higher spectral weight with the fractionalized fermionic (spin) and bosonic (charge) excitations.
Araujo M. A. N.
Ribeiro Paul
Sacramento Pedro D.
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