1. The Spin Stiffness and the Transverse Susceptibility of the Half-filled Hubbard Model
- Author
-
Rajiv R. P. Singh and Zhu-Pei Shi
- Subjects
Physics ,Hubbard model ,Condensed matter physics ,Condensed Matter (cond-mat) ,General Physics and Astronomy ,FOS: Physical sciences ,Condensed Matter ,01 natural sciences ,Square lattice ,010305 fluids & plasmas ,Transverse plane ,Magnetization ,0103 physical sciences ,Spin density wave ,Ising model ,Condensed Matter::Strongly Correlated Electrons ,010306 general physics ,Series expansion ,Spin-½ - Abstract
The $T=0$ spin stiffness $\rho _{s}$ and the transverse susceptibility $\chi _{\perp }$ 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., Comment: 9 Revtex pages, 3 Postscript figures, Europhys. Lett. in press
- Published
- 1995