Evidence for a superfluid density in t--J ladders

Authors:
  • CHC. A. Hayward
    C. A. Hayward
  • DPD. Poilblanc
    D. Poilblanc
  • RNR. M. Noack
    R. M. Noack
  • DSD. J. Scalapino
    D. J. Scalapino
  • WHW. Hanke
    W. Hanke
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Abstract
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.