Volume 60, Number 2, October 2002
|Page(s)||262 - 268|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 October 2002|
Temperature-driven crossover phenomena in the correlation lengths of the one-dimensional -J model
Theoretische Physik I, Universität Dortmund Otto-Hahn-Str. 4, D-44221 Dortmund, Germany
Accepted: 6 August 2002
We describe a modified transfer matrix renormalization group (TMRG) algorithm and apply it to calculate thermodynamic properties of the one-dimensional model. At the supersymmetric point we compare with Bethe ansatz results and make direct connection to conformal field theory (CFT). In particular we study the crossover from the non-universal high-T lattice into the quantum critical regime by calculating various correlation lengths and static correlation functions. Finally, the existence of a spin-gap phase is confirmed.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 05.10.Cc – Renormalization group methods / 05.70.-a – Thermodynamics
© EDP Sciences, 2002
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