A spin-charge-separated effective model with many-body Wannier function extrapolation reproduces the optical conductivity of one-dimensional Hubbard models for U/T between 5 and 10.
Tomonaga, Prog
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A charge model as an effective model of one-dimensional Hubbard and extended Hubbard systems: its application to linear optical spectrum calculations in large systems based upon many-body Wannier functions
A spin-charge-separated effective model with many-body Wannier function extrapolation reproduces the optical conductivity of one-dimensional Hubbard models for U/T between 5 and 10.