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arXiv:cond-mat/0207134 · Journal of Physics and Chemistry of Solids

Correlation effects on the Fermi surface of the two-dimensional Hubbard model

Yuichi Otsuka, Yosuke Morita, Yasuhiro Hatsugai

Published Jun 1, 2002• 0 citations
arXivHTMLPDF
DOI
10.1016/s0022-3697(02)00057-4

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Cluster perturbation theory is applied to the two-dimensional Hubbard $t\ensuremath{-}{t}^{\ensuremath{'}}\ensuremath{-}{t}^{\ensuremath{'}\ensuremath{'}}\ensuremath{-}U$ model to obtain doping and temperature-dependent electronic spectral function with $4\ifmmode\times\else\texttimes\fi{}4$ and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I-like electronic dispersion becomes more pronounced, the Fermi arc turns into a large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects.
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