Abstract
The spectral properties of the 1D Hubbard model are obtained from quantum Monte Carlo simulations on large systems () using the maximum entropy method. It is shown for the first time that the one-particle excitations are characterized by dispersive cosinelike bands, in extremely good agreement with slave-boson mean-field ones. Velocities for spin and charge excitations are obtained that lead to a conformal charge . An exact sum rule for spin and charge excitations is fulfilled accurately with deviations of at most 10% only around .
- Received 21 October 1993
DOI:https://doi.org/10.1103/PhysRevLett.73.732
©1994 American Physical Society