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

A. Fledderjohann (), A. Langari and K.-H. Mütter

The European Physical Journal B: Condensed Matter and Complex Systems, 2003, vol. 36, issue 2, 193-202

Abstract: 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 × 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. Copyright Springer-Verlag Berlin/Heidelberg 2003

Date: 2003
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DOI: 10.1140/epjb/e2003-00335-8

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