Temperature driven crossover phenomena in the correlation lengths of the one-dimensional t-J model

Details Temperature driven crossover phenomena in the correlation lengths of the one-dimensional t-J model Temperature driven crossover phenomena in the correlation lengths of the one-dimensional t-J model

2002-12-16

arxiv.org/abs/cond-mat/0212369v1

Europhys. Lett. 60, 262 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 7 figures

Scientific paper

10.1209/epl/i2002-00345-2

We describe a modified transfer matrix renormalization group (TMRG) algorithm and apply it to calculate thermodynamic properties of the one-dimensional t-J 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.

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