| Issue |
Europhys. Lett.
Volume 60, Number 2, October 2002
|
|
|---|---|---|
| Page(s) | 262 - 268 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00345-2 | |
| 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
Received:
21
May
2002
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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