The spectral properties of the 1-D Hubbard model are obtained from quantum Monte Carlo simulations using the maximum entropy method. The one-particle excitations are characterized by dispersive cosine-like bands. Velocities for spin- and charge excitations are obtained that lead to a conformal charge c=0.98 +/- 0.05 for the largest system simulated (N=84). An exact sum-rule for the spin-excitations is fulfilled accurately with deviations of at most 10% only around 2 kF.
@article{arxiv.cond-mat/9312049,
title = {Spectral properties of the one-dimensional Hubbard model},
author = {R. Preuss and A. Muramatsu and W. von der Linden and F. F. Assaad and W. Hanke},
journal= {arXiv preprint arXiv:cond-mat/9312049},
year = {2009}
}
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