Abstract
Previous calculations of a $t$-matrix approximation to Hubbard's model of a half-filled narrow energy band are extended to cover all possible occupancies. The method is exact in the low-density limit. The paramagnetic state is found to be more stable than in the Kanamori approximation. The nearly half-filled band, infinite-repulsion limit is also consistent with Nagaoka's prediction. The resulting phase transitions between paramagnetic, ferromagnetic, and antiferromagnetic states occur at smaller bandwidth/potential-energy ratios than those of Penn's Hartree-Fock approach.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
