Singlet stripe phases in the planart-Jmodel

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Abstract
The dimensional crossover of coupled t-J ladders to a planar model is examined using a mean-field approach with coupling constants determined by numerical diagonalization. Having a finite spin gap, uncoupled ladders belong to the Luther-Emery class in one-dimensional fermion systems, leading to a different crossover from coupling chains. For a wide region around J/t≳1 the hole-hole correlations in a single ladder are found to be predominantly charge-density-wave type, but an attraction between hole pairs on adjacent ladders leads to a stripe phase. A quantum-mechanical melting of the hole lines at J/t≲1 leads to a Bose condensate of hole pairs, i.e., a superconducting phase.
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