Evidence for a superfluid density in t--J ladders

  title={Evidence for a superfluid density in t--J ladders},
  author={C.A.Hayward and D.Poilblanc and M.Noack and D.J.Scalapino and W.Hanke},
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…