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

Olivier Chiappa (1) , Sylvain Capponi (1) , Didier Poilblanc (1)

1 GPT-LPQ - Groupe de Physique Théorique (LPQ)

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.

Domaines: Autre [cond-mat.other]

Olivier Chiappa, Sylvain Capponi, Didier Poilblanc. Recent progress in the truncated Lanczos method : application to hole-doped spin ladders. 2000. ⟨hal-00149129⟩