Correlations in the two-dimensional Hubbard model
- 1 April 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 43 (10), 8211-8216
- https://doi.org/10.1103/physrevb.43.8211
Abstract
Using Monte Carlo simulations, we have studied the question of phase separation and pairing in the doped two-dimensional Hubbard model. For a range of U/t values greater than as well as less than the bandwidth, we find no evidence for phase separation when the system is doped away from half filling. In agreement with previous work, we find that the d-wave and extended s-wave pairing correlations are enhanced by the interaction vertex but that none of the eight different pairing correlations that we studied increases as a function of lattice size. We have also examined the dependence of the kinetic energy, which determines the total optical spectral weight, on U/t and filling 〈n〉.Keywords
This publication has 17 references indexed in Scilit:
- Constraints ons-wave pairing in the Hubbard modelPhysical Review B, 1990
- Generalized flux states of thet-JmodelPhysical Review B, 1990
- Phase separation in at-JmodelPhysical Review B, 1990
- Numerical study of the two-dimensional Hubbard model for various band fillingsPhysical Review B, 1990
- Phase separation in thet-JmodelPhysical Review Letters, 1990
- Enhanced pairing in the repulsive Hubbard model with next-nearest-neighbor hoppingPhysical Review B, 1989
- Antiferromagnetism in the Two-Dimensional Hubbard ModelPhysical Review Letters, 1989
- Landau parameters of almost-localized Fermi liquidsPhysical Review B, 1987
- Two-dimensional Hubbard model: Numerical simulation studyPhysical Review B, 1985
- Ferromagnetism in a Narrow, Almost Half-FilledBandPhysical Review B, 1966