Direct Calculation of Spin-Stiffness for Spin-1/2 Heisenberg Models
Condensed Matter
2009-10-22 v1
Abstract
The spin-stiffness of frustrated spin-1/2 Heisenberg models in one and two dimensions is computed for the first time by exact diagonalizations on small clusters that implement spin-dependent twisted boundary conditions. Finite-size extrapolation to the thermodynamic limit yields a value of for the spin-stiffness of the unfrustrated planar antiferromagnet. We also present a general discussion of the linear-response theory for spin-twists, which ultimately leads to the moment sum-rule.
Keywords
Cite
@article{arxiv.cond-mat/9405069,
title = {Direct Calculation of Spin-Stiffness for Spin-1/2 Heisenberg Models},
author = {J. Bonca and J. P. Rodriguez and J. Ferrer and K. S. Bedell},
journal= {arXiv preprint arXiv:cond-mat/9405069},
year = {2009}
}
Comments
11 pgs, TeX, LA-UR-94-94 (to be published in Phys. Rev. B)