Abstract
The critical exponents of the momentum distribution near , 3, and 5 are studied numerically for the one-dimensional U→∞ Hubbard model, using finite-size systems and extrapolating them to the thermodynamic limit. Results at agree with earlier calculations, while at 3, exponents less than 1 are obtained for finite-size systems with extrapolation to 1 (regular behavior) in the thermodynamic limit, in contrast to the earlier analytic prediction of 9/8. The distribution is regular at 5 even for finite systems. The singularity near 3 is interpreted as due to low-energy excitations near 3 in finite systems. © 1996 The American Physical Society.
- Received 15 January 1996
DOI:https://doi.org/10.1103/PhysRevB.54.1447
©1996 American Physical Society