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

A. Fledderjohann·A. Langari·K. -H. Muetter
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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 ($N=2\times 8$) 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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A. Fledderjohann, A. Langari, K. -H. Muetter. 2003-11-05. Charge density plateaux and insulating phases in the $t-J$ model with ladder geometry. https://doi.org/10.1140/epjb%2Fe2003-00335-8

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