Charge density plateaux and insulating phases in the $t-J$ model with ladder geometry

Details Charge density plateaux and insulating phases in the $t-J$ model with ladder geometry Charge density plateaux and insulating phases in the $t-J$ model with ladder geometry

2003-11-05

arxiv.org/abs/cond-mat/0311107v1

Eur. Phys. J. B 36, 193-202 (2003)

Physics

Condensed Matter

10 pages, 7 figures, RevTex4

Scientific paper

10.1140/epjb/e2003-00335-8

We discuss the occurrence and the stability of charge density plateaux in ladder-like $t-J$ systems (at zero magnetization M=0) for the cases of 2- and 3-leg ladders. Starting from isolated rungs at zero leg coupling, we study the behaviour of plateaux-related phase transitions by means of first order perturbation theory and compare our results with Lanczos diagonalizations for $t-J$ ladders ($N=2\times 8$) with increasing leg couplings. Furthermore we discuss the regimes of rung and leg couplings that should be favoured for the appearance of the charge density plateaux.

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