Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm

Details Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm

1994-05-27

arxiv.org/abs/cond-mat/9405085v1

Phys. Rev. B 50, 013515 (1994)

Physics

Condensed Matter

13 pages uuencoded compressed PostScript file including 11 figures, ETH-TH/9417

Scientific paper

10.1103/PhysRevB.50.13515

We have developed an improved version of the quantum transfer matrix algorithm. The extreme eigenvalues and eigenvectors of the transfer matrix are calculated by the recently developed look-ahead Lanczos algorithm for non-Hermitian matrices with higher efficiency and accuracy than by the power method. We have applied this method to the Heisenberg ladder. The temperature dependence of the susceptibility, specific heat, correlation length and nuclear spin relaxation rate $1/T_1$ are calculated. Our results support the existence of a spin gap of about $0.5 J$. The preprint is submitted as a uuencoded compressed PostScript file. In case of printing problems the original TeX file (without figures) can be retrieved by anonymous ftp to 'maggia.ethz.ch' filename 'CSSP/preprints/hblad.tex'. Alternatively from June 1, 1994 by WWW: URL "http://www.ips.id.ethz.ch/CSSP/preprints.html"

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