The Spin Stiffness and the Transverse Susceptibility of the Half-filled Hubbard Model
Abstract
The T=0 spin stiffness s and the transverse susceptibility of the square lattice half-filled Hubbard model are calculated as a function of the Hubbard parameter ratio U/t by series expansions around the Ising limit. We find that the calculated spin-stiffness, transverse susceptibility, and sublattice magnetization for the Hubbard model smoothly approach the Heisenberg values for large U/t. The results are compared for different U/t with RPA and other numerical studies.
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