Spectral Weight of the Hubbard Model through Cluster Perturbation Theory
Spectral Weight of the Hubbard Model through Cluster Perturbation Theory
We calculate the spectral weight of the one- and two-dimensional Hubbard models by performing exact diagonalizations of finite clusters and treating intercluster hopping with perturbation theory. Even with relatively modest clusters (e.g., 12 sites), the spectra thus obtained give an accurate description of the exact results. Spin-charge separation (i.e., an …