Recent progress in the truncated Lanczos method : application to hole-doped spin ladders

Details Recent progress in the truncated Lanczos method : application to hole-doped spin ladders Recent progress in the truncated Lanczos method : application to hole-doped spin ladders

2000-10-04

arxiv.org/abs/cond-mat/0010072v3

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 included eps figures, submitted to Phys. Rev. B; revised version

Scientific paper

10.1103/PhysRevB.63.115120

The truncated Lanczos method using a variational scheme based on Hilbert space reduction as well as a local basis change is re-examined. The energy is extrapolated as a power law function of the Hamiltonian variance. This systematic extrapolation procedure is tested quantitatively on the two-leg t-J ladder with two holes. For this purpose, we have carried out calculations of the spin gap and of the pair dispersion up to size 2x15.

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