Evidence for a superfluid density in t--J ladders

Details Evidence for a superfluid density in t--J ladders Evidence for a superfluid density in t--J ladders

1995-04-05

arxiv.org/abs/cond-mat/9504018v1

Physics

Condensed Matter

4 pages, revtex, postscript figs included, submitted to PRL

Scientific paper

10.1103/PhysRevLett.75.926

Applying three independent techniques, we give numerical evidence for a finite superfluid density in isotropic hole-doped t--J ladders: We show the existence of anomalous flux quantization, emphasising the contrasting behaviour to that found in the `Luttinger liquid' regime stabilised at low electron densities; We consider the nature of the low-lying excitation modes, finding the 1-D analog of the superconducting state; And using a density matrix renormalization group approach, we find long range pairing correlations and exponentially decaying spin-spin correlations.

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