Dynamical density-density correlations in one-dimensional Mott insulators
作者： Walter Stephan , Karlo Penc
DOI: 10.1103/PHYSREVB.54.R17269
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摘要: The dynamical density-density correlation function is calculated for the one-dimensional, half-filled Hubbard model extended with nearest-neighbor repulsion using L\'anczos algorithm finite-size systems and analytically large on-site compared to hopping amplitudes. At zone boundary an excitonic feature exists any finite exhausts most of spectral weight, even parameters where no exciton visible at zero momentum.
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