Ground State Properties of the Doped 3-Leg t-J Ladder

Details Ground State Properties of the Doped 3-Leg t-J Ladder Ground State Properties of the Doped 3-Leg t-J Ladder

1997-06-24

arxiv.org/abs/cond-mat/9706250v1

Physics

Condensed Matter

Superconductivity

14 pages, 11 postscript figures

Scientific paper

10.1103/PhysRevB.57.3031

Results for a doped 3-leg t-J ladder obtained using the density matrix renormalization group are reported. At low hole doping, the holes form a dilute gas with a uniform density. The momentum occupation of the odd band shows a sharp decrease at a large value of k_F similar to the behavior of a lightly doped t-J chain, while the even modes appear gapped. The spin-spin correlations decay as a power law consistent with the absence of a spin gap, but the pair field correlations are negligible. At larger doping we find evidence for a spin gap and as x increases further we find 3-hole diagonal domain walls. In this regime there are pair field correlations and the internal pair orbital has d_x^2-y^2 - like symmetry. However, the pair field correlations appear to fall exponentially at large distances.

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