Abstract
We calculate the zero-temperature gap and quasiparticle weight of the half-filled Hubbard model with a random dispersion relation. After extrapolation to the thermodynamic limit, we obtain reliable bounds on these quantities for the Hubbard model in infinite dimensions. Our data indicate that the Mott-Hubbard transition is continuous; i.e., the quasiparticle weight becomes zero at the same critical interaction strength at which the gap opens.
- Received 16 October 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.1915
©1999 American Physical Society
